Average MCQs with Answers and Explanations for Competitive Exams

Question #121

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The average of 6 numbers is 18. If one number is 12, find the average of the remaining 5.

A. 18.6

B. 18.4

C. 19

D. 19.2

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Correct Answer: Option D

Explanation:
Sum=6×18=108. Remaining sum=108-12=96. Avg=96/5=19.2.

This question belongs to: Maths Average

Question #122

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Find the average of all numbers from 1 to 25 that are divisible by 5.

A. 15

B. 15.5

C. 14

D. 14.5

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Correct Answer: Option A

Explanation:
Numbers: 5,10,15,20,25 sum=75, count=5, avg=15.

This question belongs to: Maths Average

Question #123

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The average of 10 numbers is 16. If each number is increased by 4, what is the new average?

A. 12

B. 20

C. 16

D. 24

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Correct Answer: Option B

Explanation:
New average =16+4=20.

This question belongs to: Maths Average

Question #124

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The average of 4 numbers is 26. If each number is decreased by 2, what is the new average?

A. 28

B. 22

C. 26

D. 24

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Correct Answer: Option D

Explanation:
New average =26-2=24.

This question belongs to: Maths Average

Question #125

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The average of 7 numbers is 35. If one number is 45, find the average of the remaining 6.

A. 33

B. 32.5

C. 34

D. 33.33

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Correct Answer: Option D

Explanation:
Sum=7×35=245. Remaining sum=245-45=200. Avg=200/6=33.33.

This question belongs to: Maths Average

Question #126

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What is the average of the first 4 prime numbers?

A. 4.0

B. 4.25

C. 5

D. 4.5

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Correct Answer: Option B

Explanation:
Primes:2,3,5,7 sum=17, avg=17/4=4.25.

This question belongs to: Maths Average

Question #127

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The average of 5 numbers is 31. If each number is multiplied by 2 and then 4 is added, what is the new average?

A. 68

B. 64

C. 66

D. 62

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Correct Answer: Option C

Explanation:
New average = (31×2)+4 =62+4=66.

This question belongs to: Maths Average

Question #128

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The average of 6 numbers is 24. If each number is increased by 6, what is the new average?

A. 24

B. 30

C. 36

D. 18

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Correct Answer: Option B

Explanation:
New average =24+6=30.

This question belongs to: Maths Average

Question #129

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The average of 9 numbers is 33. If one number is 55, find the average of the remaining 8.

A. 30

B. 30.25

C. 29.75

D. 31

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Correct Answer: Option B

Explanation:
Sum=9×33=297. Remaining sum=297-55=242. Avg=242/8=30.25.

This question belongs to: Maths Average

Question #130

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Find the average of the first 6 multiples of 3.

A. 10.5

B. 11

C. 10

D. 9.5

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Correct Answer: Option A

Explanation:
Multiples:3,6,9,12,15,18 sum=63, count=6, avg=10.5.

This question belongs to: Maths Average

Question #131

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The average of 4 numbers is 14. If each number is divided by 2, what is the new average?

A. 6

B. 7

C. 9

D. 8

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Correct Answer: Option B

Explanation:
New average =14/2=7.

This question belongs to: Maths Average

Question #132

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The average of 8 numbers is 26. If one number is 30, find the average of the remaining 7.

A. 26

B. 24.86

C. 25.43

D. 25.5

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Correct Answer: Option C

Explanation:
Sum=8×26=208. Remaining sum=208-30=178. Avg=178/7=25.43.

This question belongs to: Maths Average

Question #133

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The average of 5 numbers is 42. If two numbers are 38 and 44, find the average of the remaining three.

A. 43

B. 42

C. 42.67

D. 41.33

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Correct Answer: Option C

Explanation:
Sum=5×42=210. Sum of two=38+44=82. Sum of three=128. Avg=128/3=42.67.

This question belongs to: Maths Average

Question #134

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What is the average of all odd numbers from 1 to 29?

A. 15

B. 14.5

C. 15.5

D. 14

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Correct Answer: Option A

Explanation:
Odd numbers 1 to 29: 15 terms. Sum = n^2 =15^2=225. Average=225/15=15.

This question belongs to: Maths Average

Question #135

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The average of 3 numbers is 22. If the numbers are in the ratio 2:3:6, find the largest.

A. 36

B. 42

C. 30

D. 24

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Correct Answer: Option A

Explanation:
Sum=3×22=66. Ratio sum=2+3+6=11. Largest = (6/11)×66=36.

This question belongs to: Maths Average

Question #136

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The average of 10 numbers is 14. If each number is decreased by 3, what is the new average?

A. 11

B. 14

C. 8

D. 17

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Correct Answer: Option A

Explanation:
New average =14-3=11.

This question belongs to: Maths Average

Question #137

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The average weight of 7 persons is 58 kg. If a person weighing 68 kg joins, what is the new average?

A. 58.75 kg

B. 59.25 kg

C. 59.5 kg

D. 60 kg

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Correct Answer: Option B

Explanation:
Sum=7×58=406. New sum=406+68=474. New avg=474/8=59.25.

This question belongs to: Maths Average

Question #138

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The average of 6 numbers is 27. If one number is 33, find the average of the remaining 5.

A. 26

B. 26.2

C. 25.8

D. 25.4

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Correct Answer: Option C

Explanation:
Sum=6×27=162. Remaining sum=162-33=129. Avg=129/5=25.8.

This question belongs to: Maths Average

Question #139

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The average of 4 numbers is 21. If the average of first two numbers is 18, what is the average of the last two numbers?

A. 22

B. 23

C. 24

D. 21.5

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Correct Answer: Option C

Explanation:
Sum of all =4×21=84. Sum of first two =2×18=36. Sum of last two =84-36=48. Average of last two =48/2=24.

This question belongs to: Maths Average

Question #140

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The average of 5 numbers is 38. If each number is multiplied by 2 and then 5 is subtracted, what is the new average?

A. 81

B. 76

C. 66

D. 71

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Correct Answer: Option D

Explanation:
New average = (38×2) -5 =76-5=71.

This question belongs to: Maths Average

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