Average of 10 numbers 2580. If average of 6 is 2575, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 2580. If average of 6 is 2575, average of remaining 4?

A. 2585

B. 2586

C. 2587.5

D. 2590

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum10=25800. Sum6=15450. Remaining=10350. Average=2587.5.

This question belongs to: Maths Average

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Question #1

Average of 645,860,1075 is

A. 860

B. 850

C. 855

D. 870

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Correct Answer: Option A

Explanation:
2580/3=860.

This question belongs to: Maths Average

Question #2

Average of 10 numbers 430. If average of 6 is 425, average of remaining 4?

A. 440

B. 435

C. 437.5

D. 436

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Correct Answer: Option C

Explanation:
Sum10=4300. Sum6=2550. Remaining=1750. Average=437.5.

This question belongs to: Maths Average

Question #3

Average of 15 numbers is 40. Average of first 8 is 35. Average of last 8 is 45. Find the 8th number.

A. 45

B. 40

C. 42

D. 35

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Correct Answer: Option B

Explanation:
Sum15=600. Sum first8=280. Sum last8=360. 8th =280 +360 -600 =40.

This question belongs to: Maths Average

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