Average MCQs

Practice Average MCQs with answers and detailed explanations. Learn basic average concepts, average age, marks, salary, speed, combined average, weighted average and advanced aptitude questions designed for SSC, Railway, Banking, UPSC, JKSSB, Police, Teaching and other competitive exams.

965 Total

Question #121 Report Error

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

A. 18.6

B. 19

C. 19.2

D. 18.4

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #122 Report Error

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

A. 14

B. 15.5

C. 14.5

D. 15

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #123 Report Error

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

A. 12

B. 16

C. 24

D. 20

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Correct Answer: Option D

Explanation:
New average =16+4=20.

This question belongs to: Maths Average

Question #124 Report Error

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

A. 26

B. 22

C. 28

D. 24

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Correct Answer: Option D

Explanation:
New average =26-2=24.

This question belongs to: Maths Average

Question #125 Report Error

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

A. 32.5

B. 34

C. 33

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 Report Error

What is the average of the first 4 prime numbers?

A. 5

B. 4.5

C. 4.25

D. 4.0

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #127 Report Error

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. 62

C. 66

D. 64

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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 Report Error

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

A. 24

B. 36

C. 18

D. 30

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Correct Answer: Option D

Explanation:
New average =24+6=30.

This question belongs to: Maths Average

Question #129 Report Error

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

A. 30

B. 31

C. 30.25

D. 29.75

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #130 Report Error

Find the average of the first 6 multiples of 3.

A. 10

B. 9.5

C. 10.5

D. 11

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #131 Report Error

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

A. 8

B. 9

C. 7

D. 6

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Correct Answer: Option C

Explanation:
New average =14/2=7.

This question belongs to: Maths Average

Question #132 Report Error

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

A. 26

B. 25.43

C. 25.5

D. 24.86

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #133 Report Error

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

A. 42

B. 41.33

C. 43

D. 42.67

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Correct Answer: Option D

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 Report Error

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

A. 15

B. 14

C. 14.5

D. 15.5

View Answer & Solution Discuss

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 Report Error

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

A. 42

B. 30

C. 36

D. 24

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #136 Report Error

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

A. 11

B. 14

C. 17

D. 8

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
New average =14-3=11.

This question belongs to: Maths Average

Question #137 Report Error

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

A. 59.5 kg

B. 58.75 kg

C. 60 kg

D. 59.25 kg

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #138 Report Error

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

A. 26.2

B. 25.8

C. 25.4

D. 26

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Correct Answer: Option B

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

This question belongs to: Maths Average

Question #139 Report Error

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. 23

B. 22

C. 21.5

D. 24

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Correct Answer: Option D

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 Report Error

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. 76

B. 81

C. 71

D. 66

View Answer & Solution Discuss

Correct Answer: Option C

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

This question belongs to: Maths Average

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