The average of 6 numbers is 20. If one number is 10, find the average of the rest. MCQ with Answer and Explanation

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The average of 6 numbers is 20. If one number is 10, find the average of the rest.

A. 20.5

B. 22

C. 21

D. 21.5

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum=6×20=120. Rest sum=120-10=110. Avg=110/5=22.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Average of 12 numbers 520. If average of 8 is 515, average of remaining 4?

A. 530

B. 525

C. 532

D. 528

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Correct Answer: Option A

Explanation:
Sum12=6240. Sum8=4120. Remaining=2120. Average=530.

This question belongs to: Maths Average

Question #2

Average of 15 numbers 1010. If average of 9 is 1005, average of remaining 6?

A. 1020

B. 1017.5

C. 1015

D. 1018

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Correct Answer: Option B

Explanation:
Sum15=15150. Sum9=9045. Remaining=6105. Average=1017.5.

This question belongs to: Maths Average

Question #3

Average of 50 numbers is 38. The number 45 was wrongly written as 54. Correct average?

A. 38

B. 37.82

C. 37.8

D. 39

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Correct Answer: Option B

Explanation:
Error +9, decrease 9/50=0.18, correct average=38-0.18=37.82.

This question belongs to: Maths Average

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