Average of 12 numbers 2420. If average of 8 is 2415, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 2420. If average of 8 is 2415, average of remaining 4?

A. 2430

B. 2425

C. 2428

D. 2432

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum12=29040. Sum8=19320. Remaining=9720. Average=2430.

This question belongs to: Maths Average

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Question #1

Average of 30 numbers 42. If average of 20 is 40, average of remaining 10?

A. 44

B. 48

C. 46

D. 45

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Correct Answer: Option C

Explanation:
Total=1260. Sum20=800. Remaining=460. Average=46.

This question belongs to: Maths Average

Question #2

The average of 6 numbers is 21. If one number is 15, find the average of the remaining 5.

A. 21.4

B. 22

C. 22.2

D. 21.6

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Correct Answer: Option C

Explanation:
Sum=6×21=126. Remaining sum=126-15=111. Avg=111/5=22.2.

This question belongs to: Maths Average

Question #3

The average of 6 numbers is 18. If one number is 30, find the average of the remaining 5.

A. 16

B. 15.6

C. 14.4

D. 16.8

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Correct Answer: Option B

Explanation:
Sum=6×18=108. Remaining sum=108-30=78. Avg=78/5=15.6.

This question belongs to: Maths Average

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