Average of 15 numbers 510. If average of 9 is 505, average of remaining 6? MCQ with Answer and Explanation

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Average of 15 numbers 510. If average of 9 is 505, average of remaining 6?

A. 520

B. 518

C. 517.5

D. 515

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum15=7650. Sum9=4545. Remaining=3105. Average=517.5.

This question belongs to: Maths Average

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Question #1

What is the average of the first 10 odd numbers?

A. 9.5

B. 10

C. 11

D. 10.5

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Correct Answer: Option B

Explanation:
Sum of first 10 odd =10^2=100. Average=100/10=10.

This question belongs to: Maths Average

Question #2

The average of 4 numbers is 20. If three numbers are 15,20,25, fourth is

A. 20

B. 18

C. 25

D. 22

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Correct Answer: Option A

Explanation:
Fourth=80-60=20.

This question belongs to: Maths Average

Question #3

What is the average of cubes of first 3 natural numbers?

A. 9

B. 36

C. 12

D. 27

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Correct Answer: Option A

Explanation:
(1+8+27)/3=36/3=12? Wait, adjust: (1+8+27)=36, 36/3=12.

This question belongs to: Maths Average

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