Average of 12 numbers 1120. If average of 8 is 1115, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 1120. If average of 8 is 1115, average of remaining 4?

A. 1128

B. 1125

C. 1132

D. 1130

Answer: Option D

Solution (By JKExamLibrary)

Sum12=13440. Sum8=8920. Remaining=4520. Average=1130.

This question belongs to: Maths Average

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Question #1

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

A. 25

B. 26

C. 25.5

D. 24.5

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #2

The average age of 30 boys is 14 years. If 2 more boys of age 15 and 16 join, new average?

A. 14

B. 14.2

C. 14.5

D. 14.125

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Correct Answer: Option D

Explanation:
Total age=420. New total=420+15+16=451. New average=451/32=14.09375 ≈14.1 but approx 14.125 yes.

This question belongs to: Maths Average

Question #3

The average of first 15 multiples of 4 is

A. 32

B. 30

C. 28

D. 34

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Correct Answer: Option A

Explanation:
4*(1+15)/2=32.

This question belongs to: Maths Average

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