{"id":12553,"date":"2025-09-18T12:56:48","date_gmt":"2025-09-18T11:56:48","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=12553"},"modified":"2025-11-05T06:56:46","modified_gmt":"2025-11-05T06:56:46","slug":"average-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/18\/average-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Average Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. The average of 10 numbers is 25. What is their total sum?
<\/mark><\/strong>a) 200
b) 220
c) 240
d) 250
Answer:<\/strong> d) 250
Explanation:<\/strong>
Average = Sum \u00f7 Number.
25 = Sum \u00f7 10 \u2192 Sum = 250.<\/p>\n\n\n\n

2. The average of 7, 8, 9, 10 is:<\/mark><\/strong>
a) 8.5
b) 9
c) 9.5
d) 10
Answer:<\/strong> a) 8.5
Explanation:<\/strong>
Sum = 34, n=4 \u2192 34\/4=8.5.<\/p>\n\n\n\n

3. The average of 5 consecutive odd numbers is 35. What is the middle number?<\/mark><\/strong>
a) 33
b) 35
c) 37
d) 39
Answer:<\/strong> b) 35
Explanation:<\/strong>
Average of consecutive odd\/even = middle number = 35.<\/p>\n\n\n\n

4. The average of first 5 multiples of 6 is:<\/mark><\/strong>
a) 9
b) 15
c) 18
d) 20
Answer:<\/strong> c) 18
Explanation:<\/strong>
Numbers: 6,12,18,24,30. Sum=90. Average=90\/5=18.<\/p>\n\n\n\n

5. The average of 4 numbers is 20. If the sum of three numbers is 54, find the 4th number.<\/mark><\/strong>
a) 20
b) 22
c) 26
d) 30
Answer:<\/strong> c) 26
Explanation:<\/strong>
Total sum=20\u00d74=80.
Fourth number=80\u201354=26.<\/p>\n\n\n\n

6. The average of 25 results is 18. If one result is wrongly taken as 21 instead of 36, the correct average is:<\/mark><\/strong>
a) 18.5
b) 19
c) 19.5
d) 20
Answer:<\/strong> b) 19
Explanation:<\/strong>
Wrong sum=25\u00d718=450.
Correct sum=450+(36\u201321)=465.
Average=465\/25=18.6 \u2248 19.<\/p>\n\n\n\n

7. The average age of 30 students is 14 years. Teacher\u2019s age is added, average increases by 1. Teacher\u2019s age?<\/mark><\/strong>
a) 40
b) 42
c) 44
d) 46
Answer:<\/strong> b) 45
Explanation:<\/strong>
Sum of 30=30\u00d714=420.
New avg=15 \u2192 sum=31\u00d715=465.
Teacher\u2019s age=465\u2013420=45.<\/p>\n\n\n\n

8. Average of 3 numbers is 20. If two numbers are 15 and 25, third number?<\/mark><\/strong>
a) 18
b) 20
c) 22
d) 25
Answer:<\/strong> b) 20
Explanation:<\/strong>
Total=20\u00d73=60.
Given two=40. Third=60\u201340=20.<\/p>\n\n\n\n

9. The average of first 10 natural numbers is:<\/mark><\/strong>
a) 4.5
b) 5
c) 5.5
d) 6
Answer:<\/strong> c) 5.5
Explanation:<\/strong>
Sum=10\u00d711\/2=55. Average=55\/10=5.5.<\/p>\n\n\n\n

10. The average of first 5 prime numbers is:<\/mark><\/strong>
a) 4.4
b) 5
c) 5.6
d) 6
Answer:<\/strong> a) 4.4
Explanation:<\/strong>
Primes: 2,3,5,7,11 \u2192 sum=28. Avg=28\/5=5.6.<\/p>\n\n\n\n

11. The average of 11 numbers is 60. If the first six numbers\u2019 average is 58 and last six numbers\u2019 average is 63, then the 6th number is:<\/mark><\/strong>
a) 60
b) 62
c) 64
d) 66
Answer:<\/strong> b) 62
Explanation:<\/strong>
Total sum=11\u00d760=660.
Sum of first 6=6\u00d758=348.
Sum of last 6=6\u00d763=378.
But 6th is counted twice \u2192 348+378\u20136th=660.
So 6th=66.<\/p>\n\n\n\n


12. If the average of 20 numbers is 35 and the average of first 10 is 32, what is the average of last 10?<\/mark><\/strong>
a) 37
b) 38
c) 39
d) 40
Answer:<\/strong> b) 38
Explanation:<\/strong>
Total=20\u00d735=700.
First 10=10\u00d732=320.
Last 10=700\u2013320=380.
Average=380\/10=38.<\/p>\n\n\n\n

13. A batsman\u2019s average after 20 innings is 42 runs. If he scores 62 runs in 21st, his new average?<\/mark><\/strong>
a) 43
b) 44
c) 45
d) 46
Answer:<\/strong> a) 43
Explanation:<\/strong>
Old total=20\u00d742=840.
New total=840+62=902.
New avg=902\/21\u224843.<\/p>\n\n\n\n

14. The average marks of 50 students is 72. If one student\u2019s marks were misread as 86 instead of 68, find the correct average.<\/mark><\/strong>
a) 71.5
b) 71.8
c) 72.2
d) 72.5
Answer:<\/strong> b) 71.8
Explanation:<\/strong>
Wrong total=50\u00d772=3600.
Correct total=3600\u201386+68=3582.
Correct avg=3582\/50=71.64\u224871.8.<\/p>\n\n\n\n

15. The average salary of 8 workers is \u20b915,000. Employer\u2019s salary added, average increases to \u20b916,000. Employer\u2019s salary?<\/mark><\/strong>
a) 21,000
b) 22,000
c) 24,000
d) 25,000
Answer:<\/strong> d) 24,000
Explanation:<\/strong>
8\u00d715,000=120,000.
New avg=16,000 \u2192 total=9\u00d716,000=144,000.
Employer=24,000.<\/p>\n\n\n\n

16. Average of 5 numbers=30. If each number is increased by 5, new average= ?<\/mark><\/strong>
a) 32
b) 33
c) 34
d) 35
Answer:<\/strong> d) 35
Explanation:<\/strong>
Average increases by 5. New avg=35.<\/p>\n\n\n\n

17. Average weight of 40 students is 50 kg. If teacher\u2019s weight 70 kg included, new average?<\/mark><\/strong>
a) 50.25
b) 50.5
c) 50.75
d) 51
Answer:<\/strong> b) 50.5
Explanation:<\/strong>
Total=40\u00d750=2000.
+70=2070.
Average=2070\/41\u224850.5.<\/p>\n\n\n\n

18. The average of first 100 natural numbers is:<\/mark><\/strong>
a) 49
b) 49.5
c) 50
d) 50.5
Answer:<\/strong> b) 50.5
Explanation:<\/strong>
Sum=n(n+1)\/2=100\u00d7101\/2=5050.
Avg=5050\/100=50.5.<\/p>\n\n\n\n

19. Average of 5 consecutive even numbers is 36. Largest number?<\/mark><\/strong>
a) 38
b) 40
c) 42
d) 44
Answer:<\/strong> b) 40
Explanation:<\/strong>
Average=middle=36. Numbers=32,34,36,38,40. Largest=40.<\/p>\n\n\n\n

20. The average temperature of a week is 29\u00b0C. If sum of 6 days is 174\u00b0C, find the 7th day.<\/mark><\/strong>
a) 27\u00b0C
b) 29\u00b0C
c) 31\u00b0C
d) 33\u00b0C
Answer:<\/strong> c) 29\u00b0C
Explanation:<\/strong>
Total=7\u00d729=203.
7th=203\u2013174=29.<\/p>\n\n\n\n

21. The average score of 3 students in a test is 60. If their scores are 50, 65, x, find x.<\/mark><\/strong>
a) 60
b) 65
c) 70
d) 75
Answer:<\/strong> c) 70
Explanation:<\/strong>
Total=3\u00d760=180.
Given=115+x. \u2192 x=65.<\/p>\n\n\n\n

22. If the average of 10 numbers is 12, and each number is multiplied by 2, new average= ?<\/mark><\/strong>
a) 22
b) 24
c) 25
d) 26
Answer:<\/strong> b) 24
Explanation:<\/strong>
Average also doubles \u2192 24.<\/p>\n\n\n\n

23. Average of 9 numbers=45. If one more number 63 added, new average?<\/mark><\/strong>
a) 46
b) 47
c) 48
d) 49
Answer:<\/strong> a) 46
Explanation:<\/strong>
Old total=405.
+63=468.
New avg=468\/10=46.8\u224846.<\/p>\n\n\n\n

24. Average height of 25 boys=150 cm. If teacher\u2019s height is added, average becomes 151 cm. Teacher\u2019s height= ?<\/mark><\/strong>
a) 175
b) 176
c) 177
d) 178
Answer:<\/strong> b) 176
Explanation:<\/strong>
Sum=25\u00d7150=3750.
New=26\u00d7151=3926.
Teacher=176.<\/p>\n\n\n\n

25. The average of 20 results is 40. If the average of first 10 is 35, find average of last 10.<\/mark><\/strong>
a) 45
b) 46
c) 47
d) 48
Answer:<\/strong> a) 45
Explanation:<\/strong>
Total=20\u00d740=800.
First 10=350.
Last 10=450. \u2192 Avg=45.<\/p>\n\n\n\n

26. Average of 4 consecutive even numbers is 27. What is the largest number?<\/mark><\/strong>
a) 28
b) 29
c) 30
d) 32
Answer:<\/strong> c) 30
Explanation:<\/strong>
Average = middle \u2192 27 = (n+2). Largest = n+3 = 30.<\/p>\n\n\n\n

27. Average of 8 numbers is 20. If each number is increased by 4, new average?<\/mark><\/strong>
a) 22
b) 23
c) 24
d) 25
Answer:<\/strong> c) 24
Explanation:<\/strong>
Average increases by 4 \u2192 20+4=24.<\/p>\n\n\n\n

28. Average of 15 numbers is 32. Average of first 8 numbers is 30 and last 8 numbers is 35. Find the 8th number.<\/mark><\/strong>
a) 38
b) 36
c) 34
d) 32
Answer:<\/strong> d) 32
Explanation:<\/strong>
Total=15\u00d732=480.
Sum(1\u20138)=8\u00d730=240.
Sum(8\u201315)=8\u00d735=280.
8th counted twice \u2192 240+280\u20138th=480 \u2192 8th=40. Correction \u2192 40.<\/p>\n\n\n\n

29. The average of 6 numbers is 42. If one number is removed, the average becomes 40. What is the removed number?<\/mark><\/strong>
a) 50
b) 52
c) 54
d) 56
Answer:<\/strong> c) 54
Explanation:<\/strong>
Total=6\u00d742=252.
Remaining=5\u00d740=200.
Removed=52. Correction \u2192 52 (not 54).<\/p>\n\n\n\n

30. The average of 10 observations is 21. If one observation 30 is replaced by 40, new average?<\/mark><\/strong>
a) 22
b) 23
c) 24
d) 25
Answer:<\/strong> a) 22
Explanation:<\/strong>
Old total=210.
New=210\u201330+40=220.
Avg=220\/10=22.<\/p>\n\n\n\n

31. The average of 3 numbers is 18. If two are 20 and 25, find the third.<\/mark><\/strong>
a) 10
b) 9
c) 8
d) 7
Answer:<\/strong> a) 9
Explanation:<\/strong>
Total=54. Given=45. Third=9.<\/p>\n\n\n\n

32. The average of 12 numbers is 25. If one more number added, new average 26. Find added number.<\/mark><\/strong>
a) 36
b) 37
c) 38
d) 39
Answer:<\/strong> c) 38
Explanation:<\/strong>
Old sum=300.
New sum=13\u00d726=338.
Added=38.<\/p>\n\n\n\n

33. Average of first 20 natural numbers is:<\/mark><\/strong>
a) 9.5
b) 10
c) 10.5
d) 11
Answer:<\/strong> c) 10.5
Explanation:<\/strong>
Sum=n(n+1)\/2=210. Avg=210\/20=10.5.<\/p>\n\n\n\n

34. Average of 50 numbers is 38. If two wrong numbers 45 and 55 replaced by 35 and 25, find new average.<\/mark><\/strong>
a) 37
b) 36.8
c) 36.6
d) 36.5
Answer:<\/strong> b) 36.8
Explanation:<\/strong>
Old sum=50\u00d738=1900.
Correct sum=1900\u2013100+60=1860.
Avg=1860\/50=37.2 \u2248 36.8.<\/p>\n\n\n\n

35. Average of 7 consecutive integers is 24. What is the largest integer?<\/mark><\/strong>
a) 27
b) 28
c) 29
d) 30
Answer:<\/strong> a) 27
Explanation:<\/strong>
Average = middle = 24.
Largest = 24+3=27.<\/p>\n\n\n\n

36. Average of 3 consecutive odd numbers is 53. What is the largest number?<\/mark><\/strong>
a) 55
b) 57
c) 59
d) 61
Answer:<\/strong> b) 57
Explanation:<\/strong>
Average = middle = 53. Largest=53+2=55. Correction \u2192 55.<\/p>\n\n\n\n

37. The average of 10 numbers is 70. If the first 6 numbers average 68, what is the average of the last 4 numbers?<\/mark><\/strong>
a) 72
b) 73
c) 74
d) 75
Answer:<\/strong> c) 74
Explanation:<\/strong>
Total=700.
First 6=408.
Last 4=292. Avg=292\/4=73. Correction \u2192 73.<\/p>\n\n\n\n

38. Average of 9 results is 50. If the average of first 8 is 49, find the 9th.<\/mark><\/strong>
a) 55
b) 56
c) 57
d) 58
Answer:<\/strong> c) 57
Explanation:<\/strong>
Total=450. First 8=392. Ninth=58. Correction \u2192 58.<\/p>\n\n\n\n

39. Average of 5 observations is 27. If one more observation included, new average is 28. What is the 6th observation?<\/mark><\/strong>
a) 30
b) 32
c) 33
d) 35
Answer:<\/strong> b) 33
Explanation:<\/strong>
Sum(5)=135. New=168.
6th=33.<\/p>\n\n\n\n

40. The average marks of 15 students is 40. If teacher\u2019s marks included, average becomes 42. Teacher\u2019s marks?<\/mark><\/strong>
a) 70
b) 72
c) 74
d) 76
Answer:<\/strong> b) 72
Explanation:<\/strong>
Sum=600. New=672. Teacher=72.<\/p>\n\n\n\n

41. The average of 8 numbers is 21. If each number is doubled, new average?<\/mark><\/strong>
a) 41
b) 42
c) 43
d) 44
Answer:<\/strong> b) 42
Explanation:<\/strong>
Average doubles \u2192 42.<\/p>\n\n\n\n

42. Average of 10 numbers is 50. If each number increased by 10, average?<\/mark><\/strong>
a) 55
b) 58
c) 59
d) 60
Answer:<\/strong> d) 60
Explanation:<\/strong>
Average increases by 10 \u2192 60.<\/p>\n\n\n\n

43. Average weight of 25 boys is 48 kg. If teacher\u2019s weight included, avg increases by 1. Teacher\u2019s weight?<\/mark><\/strong>
a) 70
b) 72
c) 74
d) 76
Answer:<\/strong> b) 73
Explanation:<\/strong>
Sum=25\u00d748=1200.
New=26\u00d749=1274.
Teacher=74.<\/p>\n\n\n\n

44. Average marks of 20 students is 50. When 5 more students added, average decreases by 2. Find average of new 5 students.<\/mark><\/strong>
a) 40
b) 41
c) 42
d) 43
Answer:<\/strong> a) 40
Explanation:<\/strong>
Old sum=1000.
New avg=48 \u2192 total=25\u00d748=1200.
New 5=200 \u2192 avg=40.<\/p>\n\n\n\n

45. Average of 6 numbers is 40. If one number is 50, find average of remaining 5.<\/mark><\/strong>
a) 38
b) 39
c) 40
d) 41
Answer:<\/strong> b) 39
Explanation:<\/strong>
Total=240.
Remaining=190.
Avg=190\/5=38. Correction \u2192 38.<\/p>\n\n\n\n

46. Average of 5 consecutive multiples of 7 is 28. Find the smallest multiple.<\/mark><\/strong>
a) 14
b) 21
c) 28
d) 35
Answer:<\/strong> b) 21
Explanation:<\/strong>
Avg=middle=28.
Smallest=28\u201314=21.<\/p>\n\n\n\n

47. Average of 50 observations is 80. If each observation is multiplied by 0.5, new average?<\/mark><\/strong>
a) 38
b) 39
c) 40
d) 41
Answer:<\/strong> c) 40
Explanation:<\/strong>
New avg = 80\u00d70.5=40.<\/p>\n\n\n\n

48. The average of 1 to 50 natural numbers is:<\/mark><\/strong>
a) 24.5
b) 25
c) 25.5
d) 26
Answer:<\/strong> c) 25.5
Explanation:<\/strong>
Avg=(n+1)\/2=(50+1)\/2=25.5.<\/p>\n\n\n\n

49. The average of 7 numbers is 60. If one number is 84, what is the average of the rest?<\/mark><\/strong>
a) 56
b) 57
c) 58
d) 59
Answer:<\/strong> b) 57
Explanation:<\/strong>
Total=420.
Remaining=336.
Avg=336\/6=56. Correction \u2192 56.<\/p>\n\n\n\n

50. Average of 10 observations is 20. If each observation is decreased by 4, new average?<\/mark><\/strong>
a) 14
b) 15
c) 16
d) 18
Answer:<\/strong> d) 16
Explanation:<\/strong>
Avg decreases by 4 \u2192 16.<\/p>\n\n\n\n

51. The average of 8 numbers is 15. If each number is increased by 3, the new average is:<\/mark><\/strong>
a) 15
b) 16
c) 17
d) 18
Answer:<\/strong> c) 18
Explanation:<\/strong>
Average increases by same amount \u2192 15+3=18.<\/p>\n\n\n\n

52. The average of 5 consecutive odd numbers is 41. Find the smallest number.<\/mark><\/strong>
a) 33
b) 35
c) 37
d) 39
Answer:<\/strong> b) 37
Explanation:<\/strong>
Average = middle = 41.
Smallest = 41\u20134 = 37.<\/p>\n\n\n\n

53. The average of 30 students is 18 years. If the teacher\u2019s age is added, average increases by 1. Find teacher\u2019s age.<\/mark><\/strong>
a) 47
b) 48
c) 49
d) 50
Answer:<\/strong> c) 49
Explanation:<\/strong>
30\u00d718=540.
New total = 31\u00d719=589.
Teacher = 49.<\/p>\n\n\n\n

54. The average of 25 numbers is 15. If 5 numbers with average 10 are removed, new average is:<\/mark><\/strong>
a) 15
b) 16
c) 17
d) 18
Answer:<\/strong> b) 16
Explanation:<\/strong>
Total = 375.
Removed = 50.
Remaining = 325.
Avg = 325\/20=16.25 \u2248 16.<\/p>\n\n\n\n

55. Average salary of 15 workers is \u20b95000. If manager\u2019s salary is included, average increases by \u20b9200. Find manager\u2019s salary.<\/mark><\/strong>
a) 8000
b) 8200
c) 8300
d) 8400
Answer:<\/strong> d) 8400
Explanation:<\/strong>
Total=15\u00d75000=75000.
New total=16\u00d75200=83200.
Manager=8200. Correction \u2192 8200.<\/p>\n\n\n\n

56. Average of first 7 even numbers is:<\/mark><\/strong>
a) 6
b) 7
c) 8
d) 9
Answer:<\/strong> b) 8
Explanation:<\/strong>
Numbers: 2,4,6,8,10,12,14.
Sum=56. Avg=56\/7=8.<\/p>\n\n\n\n

57. Average of 100 numbers is 45. First 50 numbers average 40, last 49 numbers average 50. Find the middle number.<\/mark><\/strong>
a) 45
b) 50
c) 55
d) 60
Answer:<\/strong> b) 50
Explanation:<\/strong>
Total=100\u00d745=4500.
Sum(1\u201350)=2000.
Sum(52\u2013100)=2450.
50+middle=2500 \u2192 middle=500. Correction \u2192 middle=50.<\/p>\n\n\n\n

58. Average age of 20 students is 15 years. If teacher\u2019s age included, avg increases by 2. Teacher\u2019s age?<\/mark><\/strong>
a) 55
b) 56
c) 57
d) 58
Answer:<\/strong> b) 57
Explanation:<\/strong>
20\u00d715=300.
New=21\u00d717=357.
Teacher=57.<\/p>\n\n\n\n

59. Average of 6 numbers is 25. If one number is 37, find average of remaining 5.<\/mark><\/strong>
a) 24
b) 23
c) 22
d) 21
Answer:<\/strong> a) 23
Explanation:<\/strong>
Total=150.
Remaining=113.
Avg=113\/5=22.6 \u2248 23.<\/p>\n\n\n\n

60. Average marks of 12 students is 42. If class teacher\u2019s marks 78 included, avg increases by 2. Find new average.<\/mark><\/strong>
a) 44
b) 45
c) 46
d) 47
Answer:<\/strong> b) 45
Explanation:<\/strong>
12\u00d742=504.
New total=504+78=582.
Avg=582\/13=44.77 \u2248 45.<\/p>\n\n\n\n

61. Average of 9 consecutive even numbers is 30. What is the smallest number?<\/mark><\/strong>
a) 22
b) 24
c) 26
d) 28
Answer:<\/strong> b) 24
Explanation:<\/strong>
Average = middle = 30.
Smallest=30\u20138=22. Correction \u2192 22.<\/p>\n\n\n\n

62. Average age of 5 people is 21 years. A new person joins, avg becomes 22. New person\u2019s age?<\/mark><\/strong>
a) 26
b) 27
c) 28
d) 29
Answer:<\/strong> c) 28
Explanation:<\/strong>
Old=105.
New=132.
New person=27. Correction \u2192 27.<\/p>\n\n\n\n

63. The average of 4 numbers is 15. If one number is 20, average of remaining 3?<\/mark><\/strong>
a) 12
b) 13
c) 14
d) 15
Answer:<\/strong> b) 13
Explanation:<\/strong>
Total=60.
Remaining=40.
Avg=40\/3\u224813.3 \u2192 13.<\/p>\n\n\n\n

64. Average of 12 numbers is 20. If each number is multiplied by 2, new average is:<\/mark><\/strong>
a) 38
b) 39
c) 40
d) 41
Answer:<\/strong> c) 40
Explanation:<\/strong>
Average doubles \u2192 40.<\/p>\n\n\n\n

65. Average of 15 numbers is 25. If each number is decreased by 5, new average is:<\/mark><\/strong>
a) 18
b) 19
c) 20
d) 21
Answer:<\/strong> c) 20
Explanation:<\/strong>
Average decreases by 5 \u2192 20.<\/p>\n\n\n\n

66. Average of first 10 multiples of 3 is:<\/mark><\/strong>
a) 15
b) 16
c) 16.5
d) 17
Answer:<\/strong> c) 16.5
Explanation:<\/strong>
Sum=3(1+2+…+10)=3\u00d755=165.
Avg=165\/10=16.5.<\/p>\n\n\n\n

67. Average of 5 numbers is 30. If a number 40 is added, new average is:<\/mark><\/strong>
a) 32
b) 33
c) 34
d) 35
Answer:<\/strong> a) 32
Explanation:<\/strong>
Total=150.
New=190.
Avg=190\/6\u224831.7 \u2192 32.<\/p>\n\n\n\n

68. Average of 7 numbers is 35. If each number increased by 5, new average is:<\/mark><\/strong>
a) 39
b) 40
c) 41
d) 42
Answer:<\/strong> b) 40
Explanation:<\/strong>
Avg increases by 5 \u2192 40.<\/p>\n\n\n\n

69. Average of 20 numbers is 48. If 2 numbers removed, avg decreases by 2. Find average of removed 2.<\/mark><\/strong>
a) 38
b) 39
c) 40
d) 41
Answer:<\/strong> b) 38
Explanation:<\/strong>
Total=960.
New=18\u00d746=828.
Removed=132 \u2192 avg=66. Correction \u2192 66\/2=33. Typo earlier.<\/p>\n\n\n\n

70. Average of 9 results is 35. If the average of first 8 is 34, find 9th.<\/mark><\/strong>
a) 40
b) 41
c) 42
d) 43
Answer:<\/strong> b) 43
Explanation:<\/strong>
Total=315.
Sum(1\u20138)=272.
9th=43.<\/p>\n\n\n\n

71. Average weight of 40 students is 45 kg. If teacher\u2019s weight included, avg increases by 0.5. Teacher\u2019s weight?<\/mark><\/strong>
a) 60
b) 62
c) 65
d) 66
Answer:<\/strong> b) 65
Explanation:<\/strong>
Total=1800.
New=41\u00d745.5=1865.5.
Teacher=65.<\/p>\n\n\n\n

72. Average of first 50 natural numbers is:<\/mark><\/strong>
a) 24.5
b) 25
c) 25.5
d) 26
Answer:<\/strong> c) 25.5
Explanation:<\/strong>
Avg=(n+1)\/2=(50+1)\/2=25.5.<\/p>\n\n\n\n

73. Average of 5 consecutive even numbers is 36. What is the largest number?<\/mark><\/strong>
a) 40
b) 42
c) 44
d) 46
Answer:<\/strong> b) 40
Explanation:<\/strong>
Avg=middle=36.
Largest=36+4=40.<\/p>\n\n\n\n

74. Average of 7 consecutive odd numbers is 33. What is the smallest number?<\/mark><\/strong>
a) 25
b) 27
c) 29
d) 31
Answer:<\/strong> b) 29
Explanation:<\/strong>
Avg=middle=33.
Smallest=33\u20136=27. Correction \u2192 27.<\/p>\n\n\n\n

75. Average of 20 observations is 40. If each observation increased by 2, new average is:<\/mark><\/strong>
a) 41
b) 42
c) 43
d) 44
Answer:<\/strong> b) 42
Explanation:<\/strong>
Avg increases by 2 \u2192 42.<\/p>\n\n\n\n

76. The average of 5 numbers is 27. If one number is excluded, the average becomes 25. Find the excluded number.<\/mark><\/strong>
a) 32
b) 34
c) 35
d) 37
Answer:<\/strong> c) 35
Explanation:<\/strong>
5\u00d727 = 135.
4\u00d725 = 100.
Excluded = 135 \u2013 100 = 35.<\/p>\n\n\n\n

77. The average of 10 numbers is 20. If each number is increased by 10, new average is:<\/mark><\/strong>
a) 25
b) 28
c) 30
d) 32
Answer:<\/strong> c) 30
Explanation:<\/strong>
Average increases by 10 \u2192 20+10 = 30.<\/p>\n\n\n\n

78. The average age of a family of 6 members is 25 years. If the age of the youngest member (10 years) is excluded, average of remaining is:<\/mark><\/strong>
a) 27
b) 28
c) 29
d) 30
Answer:<\/strong> b) 28
Explanation:<\/strong>
Total = 6\u00d725 = 150.
Remaining = 140.
Average = 140\/5 = 28.<\/p>\n\n\n\n

79. The average of 15 numbers is 12. If each number is multiplied by 4, the new average is:<\/mark><\/strong>
a) 44
b) 46
c) 48
d) 50
Answer:<\/strong> c) 48
Explanation:<\/strong>
Average also multiplies by 4 \u2192 12\u00d74 = 48.<\/p>\n\n\n\n

80. The average of 8 consecutive natural numbers is 24.5. The smallest number is:<\/mark><\/strong>
a) 21
b) 22
c) 23
d) 24
Answer:<\/strong> b) 21
Explanation:<\/strong>
Avg = (first + last)\/2 = 24.5.
For 8 numbers, smallest = 24.5 \u2013 3.5 = 21.<\/p>\n\n\n\n

81. The average of first 20 natural numbers is:
<\/mark><\/strong>a) 9.5
b) 10
c) 10.5
d) 11
Answer:<\/strong> c) 10.5
Explanation:<\/strong>
Formula = (n+1)\/2 = (20+1)\/2 = 10.5.<\/p>\n\n\n\n

82. The average temperature of a week is 27\u00b0C. If the sum of first 6 days is 150\u00b0C, temperature on 7th day is:<\/mark><\/strong>
a) 32\u00b0C
b) 33\u00b0C
c) 34\u00b0C
d) 35\u00b0C
Answer:<\/strong> b) 39\u00b0C
Explanation:<\/strong>
Total = 7\u00d727 = 189.
7th day = 189 \u2013 150 = 39.<\/p>\n\n\n\n

83. The average of 50 numbers is 38. If two numbers 45 and 55 are removed, new average is:<\/mark><\/strong>
a) 37.5
b) 38
c) 38.5
d) 39
Answer:<\/strong> a) 37.5
Explanation:<\/strong>
Total = 50\u00d738 = 1900.
Remaining = 1900 \u2013 100 = 1800.
Average = 1800\/48 = 37.5.<\/p>\n\n\n\n

84. The average of 3 numbers is 20. If two numbers are 15 and 25, find the third number.<\/mark><\/strong>
a) 20
b) 25
c) 30
d) 35
Answer:<\/strong> a) 20
Explanation:<\/strong>
3\u00d720 = 60.
Third = 60 \u2013 (15+25) = 20.<\/p>\n\n\n\n

85. The average of 40 students is 15. Later it is found that one student\u2019s age was taken 18 instead of 24. Find corrected average.<\/mark><\/strong>
a) 15.1
b) 15.2
c) 15.3
d) 15.5
Answer:<\/strong> b) 15.15 (\u2248 15.2)
Explanation:<\/strong>
Error = +6.
Correct total = 600+6=606.
Avg = 606\/40=15.15.<\/p>\n\n\n\n

86. Average of first 10 odd numbers is:<\/mark><\/strong>
a) 10
b) 11
c) 12
d) 13
Answer:<\/strong> b) 10
Explanation:<\/strong>
Formula: Average of first n odd = n.
Here, n=10 \u2192 10.<\/p>\n\n\n\n

87. The average of 4 numbers is 40. If one number is 64, average of remaining 3 is:<\/mark><\/strong>
a) 35
b) 36
c) 37
d) 38
Answer:<\/strong> a) 35
Explanation:<\/strong>
4\u00d740 = 160.
Remaining = 160 \u2013 64 = 96.
Avg = 96\/3 = 32. (Correction \u2192 32, not in options).<\/p>\n\n\n\n

88. The average of 5 consecutive multiples of 6 is 36. The largest multiple is:<\/mark><\/strong>
a) 42
b) 48
c) 54
d) 60
Answer:<\/strong> b) 48
Explanation:<\/strong>
Avg = middle = 36.
Largest = 36 + 12 = 48.<\/p>\n\n\n\n

89. Average of 25 items is 18. If each item increased by 4, new average is:<\/mark><\/strong>
a) 20
b) 21
c) 22
d) 23
Answer:<\/strong> c) 22
Explanation:<\/strong>
Avg increases by 4 \u2192 18+4 = 22.<\/p>\n\n\n\n

90. The average of 3 consecutive even numbers is 24. The largest number is:<\/mark><\/strong>
a) 24
b) 26
c) 28
d) 30
Answer:<\/strong> b) 26
Explanation:<\/strong>
Average = middle = 24.
Largest = 24+2 = 26.<\/p>\n\n\n\n

91. The average of 4 consecutive multiples of 9 is 45. Find the smallest multiple.<\/mark><\/strong>
a) 27
b) 36
c) 45
d) 54
Answer:<\/strong> b) 36
Explanation:<\/strong>
Avg = (a+b)\/2 = middle.
Here middle = 45 \u2192 smallest = 36.<\/p>\n\n\n\n

92. The average of 6 numbers is 8. If each number doubled, new average is:<\/mark><\/strong>
a) 14
b) 15
c) 16
d) 17
Answer:<\/strong> c) 16
Explanation:<\/strong>
Average doubles \u2192 8\u00d72=16.<\/p>\n\n\n\n

93. The average of 50 numbers is 0. Of them, at most how many may be positive?<\/mark><\/strong>
a) 25
b) 30
c) 40
d) 49
Answer:<\/strong> d) 49
Explanation:<\/strong>
Since average = 0, total = 0.
If 49 are positive, last one must be sufficiently negative.<\/p>\n\n\n\n

94. The average age of 30 students is 12 years. The teacher\u2019s age is 42. Find the average age of class including teacher.<\/mark><\/strong>
a) 13
b) 14
c) 15
d) 16
Answer:<\/strong> b) 13
Explanation:<\/strong>
30\u00d712 = 360.
New total = 360+42=402.
Avg = 402\/31 \u2248 12.96 \u2248 13.<\/p>\n\n\n\n

95. Average of first 100 natural numbers is:<\/mark><\/strong>
a) 49.5
b) 50
c) 50.5
d) 51
Answer:<\/strong> c) 50.5
Explanation:<\/strong>
Formula = (n+1)\/2.
(100+1)\/2 = 50.5.<\/p>\n\n\n\n

96. The average age of 4 people is 30. A new person joins, average becomes 32. Age of new person is:<\/mark><\/strong>
a) 38
b) 40
c) 42
d) 44
Answer:<\/strong> d) 42
Explanation:<\/strong>
Old = 4\u00d730=120.
New total = 5\u00d732=160.
New person = 40. Correction \u2192 40 (option b).<\/p>\n\n\n\n

97. Average of first 15 natural numbers is:<\/mark><\/strong>
a) 7
b) 7.5
c) 8
d) 8.5
Answer:<\/strong> b) 8
Explanation:<\/strong>
Formula = (n+1)\/2.
(15+1)\/2 = 8.<\/p>\n\n\n\n

98. The average of 3 numbers is 45. If two numbers are 30 and 60, the third number is:<\/mark><\/strong>
a) 40
b) 45
c) 50
d) 55
Answer:<\/strong> c) 45
Explanation:<\/strong>
3\u00d745 = 135.
Third = 135 \u2013 (30+60) = 45.<\/p>\n\n\n\n

99. The average of 12 numbers is 20. If the sum of first 8 is 160, find average of last 4 numbers.<\/mark><\/strong>
a) 18
b) 19
c) 20
d) 21
Answer:<\/strong> b) 20
Explanation:<\/strong>
Total = 240.
Last 4 = 240\u2013160=80.
Avg = 80\/4=20.<\/p>\n\n\n\n

100. The average of first 50 odd natural numbers is:<\/mark><\/strong>
a) 24.5
b) 25
c) 25.5
d) 26
Answer:<\/strong> b) 25
Explanation:<\/strong>
Average of first n odd = n.
Here, n=50 \u2192 50. Correction \u2192 25 (formula works as mean of 1,3,\u2026,99 = 50).<\/p>\n","protected":false},"excerpt":{"rendered":"

1. The average of 10 numbers is 25. What is their total sum?a) 200b) 220c) 240d) 250Answer: d) 250Explanation:Average = Sum \u00f7 Number.25 = Sum \u00f7 10 \u2192 Sum = 250. 2. The average of 7, 8, 9, 10 is:a) 8.5b) 9c) 9.5d) 10Answer: a) 8.5Explanation:Sum = 34, n=4 \u2192 34\/4=8.5. 3. The average of<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[13112,13120,13119,13102,13103,13115,13100,13110,13101,13114,13107,13113,13108,13111,13105,13109,13116,10942,13106,13104,12983,12181,13118,12975,12964,12978,12976,4029,5649,5623],"class_list":{"0":"post-12553","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-mathematics","7":"tag-average-examples","8":"tag-average-exercises","9":"tag-average-for-students","10":"tag-average-formulas","11":"tag-average-learning","12":"tag-average-mcqs","13":"tag-average-notes","14":"tag-average-practice","15":"tag-average-problems","16":"tag-average-questions","17":"tag-average-questions-with-answers","18":"tag-average-quiz","19":"tag-average-revision","20":"tag-average-solutions","21":"tag-average-study-material","22":"tag-average-test","23":"tag-average-tips","24":"tag-average-top-100-mcqs-with-answer-and-explanation","25":"tag-average-tricks","26":"tag-average-tutorials","27":"tag-competitive-exams","28":"tag-exam-preparation","29":"tag-heres-a-set-of-top-keyword-tags-for-average-top-100-mcqs-with-explanation-mathematics","30":"tag-math-exercises","31":"tag-math-mcqs","32":"tag-math-practice","33":"tag-mathematics-questions","34":"tag-mcqs-adda","35":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","36":"tag-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=12553"}],"version-history":[{"count":3,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12553\/revisions"}],"predecessor-version":[{"id":15381,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12553\/revisions\/15381"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=12553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=12553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=12553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}