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. 518

B. 517.5

C. 515

D. 520

Answer: Option B

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

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The average of 4 numbers is 25. If the numbers are in the ratio 2:3:4:5, find the smallest number.

A. 15

B. 13.5

C. 14.29

D. 14

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Correct Answer: Option C

Explanation:
Sum=4×25=100. Ratio sum=14. Smallest = (2/14)×100 =14.285...≈14.29.

This question belongs to: Maths Average

Question #2

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Average of 9,18,27,36,45,54 is

A. 31.5

B. 33

C. 32

D. 30

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Correct Answer: Option A

Explanation:
189/6=31.5.

This question belongs to: Maths Average

Question #3

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Average of 20 numbers 45. If 5 numbers average 50 included, new average of 25?

A. 46

B. 44

C. 45.5

D. 47

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Correct Answer: Option A

Explanation:
Total20=900. Added=250. Total1150/25=46.

This question belongs to: Maths Average

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