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 #51 Report Error

The average of 10 numbers is 15. If each number is increased by 10, what is the new average?

A. 15

B. 25

C. 20

D. 30

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Correct Answer: Option B

Explanation:
New average =15+10=25.

This question belongs to: Maths Average

Question #52 Report Error

The average of 3 numbers is 12. If the first is 10 and the second is 15, find the third.

A. 12

B. 9

C. 11

D. 13

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Correct Answer: Option C

Explanation:
Sum=3×12=36. Third=36-10-15=11.

This question belongs to: Maths Average

Question #53 Report Error

The average of 5 numbers is 26. If one number is 30, find the average of the rest.

A. 26

B. 25

C. 25.5

D. 24.5

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Correct Answer: Option B

Explanation:
Sum=5×26=130. Rest sum=130-30=100. Avg=100/4=25.

This question belongs to: Maths Average

Question #54 Report Error

The average of 5 numbers is 20. If each number is divided by 2, what is the new average?

A. 15

B. 10

C. 5

D. 20

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Correct Answer: Option B

Explanation:
New average =20/2=10.

This question belongs to: Maths Average

Question #55 Report Error

The average of 4 numbers is 15. If one number is 0, what is the average of the other three?

A. 15

B. 18

C. 22.5

D. 20

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Correct Answer: Option D

Explanation:
Sum=4×15=60. Other sum=60-0=60. Avg=60/3=20.

This question belongs to: Maths Average

Question #56 Report Error

Find the average of the first 5 composite numbers.

A. 7.4

B. 8

C. 7.6

D. 6.8

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Correct Answer: Option A

Explanation:
First 5 composites: 4,6,8,9,10 sum=37, avg=37/5=7.4.

This question belongs to: Maths Average

Question #57 Report Error

The average of 9 numbers is 30. If each number is increased by 2, what is the new average?

A. 34

B. 28

C. 30

D. 32

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Correct Answer: Option D

Explanation:
New average =30+2=32.

This question belongs to: Maths Average

Question #58 Report Error

The average of 6 numbers is 24. If one number is 36, find the average of the rest.

A. 22.8

B. 21.6

C. 20.4

D. 22

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Correct Answer: Option B

Explanation:
Sum=6×24=144. Rest sum=144-36=108. Avg=108/5=21.6.

This question belongs to: Maths Average

Question #59 Report Error

The average of 3 numbers is 15. If each number is multiplied by 4, what is the new average?

A. 75

B. 60

C. 45

D. 30

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Correct Answer: Option B

Explanation:
New average =15×4=60.

This question belongs to: Maths Average

Question #60 Report Error

What is the average of the first 9 odd numbers?

A. 10

B. 8.5

C. 9

D. 9.5

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Correct Answer: Option C

Explanation:
Sum of first n odd numbers = n^2 =9^2=81. Average=81/9=9.

This question belongs to: Maths Average

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