Average of 12 numbers 820. If average of 8 is 815, average of remaining 4? MCQ with Answer and Explanation

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Average of 12 numbers 820. If average of 8 is 815, average of remaining 4?

A. 830

B. 825

C. 828

D. 832

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum12=9840. Sum8=6520. Remaining=3320. Average=830.

This question belongs to: Maths Average

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Question #1

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The average age of 6 children is 10 years. If the age of one child is 8, find the average age of the remaining 5.

A. 10

B. 9.6

C. 11

D. 10.4

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Correct Answer: Option D

Explanation:
Sum=6×10=60. Remaining sum=60-8=52. Avg=52/5=10.4.

This question belongs to: Maths Average

Question #2

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Average of 25 numbers 40. If average of first 13 is 38, average of last 13 is 42, what is the 13th number?

A. 40

B. 42

C. 39

D. 38

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Correct Answer: Option A

Explanation:
Sum25=1000. Sum1-13=494. Sum13-25=546. 13th=494+546-1000=40.

This question belongs to: Maths Average

Question #3

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The average of 10, 20, 30 is 20, average of 30,40,50 is 40, average of 10,20,30,40,50 is

A. 30

B. 35

C. 32

D. 28

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Correct Answer: Option A

Explanation:
Sum=150. Average=30.

This question belongs to: Maths Average

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