Average of 10,20,30,40 is MCQ with Answer and Explanation

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Average of 10,20,30,40 is

A. 22.5

B. 20

C. 25

D. 30

Answer: Option C

Solution (By JKSSB Mock Tests)

100/4=25.

This question belongs to: Maths Average

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Question #1

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Average of 9 numbers is 50. If 60 is replaced by 40, new average?

A. 49

B. 50

C. 48

D. 47

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Correct Answer: Option C

Explanation:
Change -20, decrease 20/9≈2.22, 50-2.22≈47.78 approx 48.

This question belongs to: Maths Average

Question #2

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Average of 15 numbers 2760. If average of 9 is 2755, average of remaining 6?

A. 2767.5

B. 2765

C. 2768

D. 2770

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Correct Answer: Option A

Explanation:
Sum15=41400. Sum9=24795. Remaining=16605. Average=2767.5.

This question belongs to: Maths Average

Question #3

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Average of 12 numbers 2570. If average of 8 is 2565, average of remaining 4?

A. 2580

B. 2582

C. 2578

D. 2575

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Correct Answer: Option A

Explanation:
Sum12=30840. Sum8=20520. Remaining=10320. Average=2580.

This question belongs to: Maths Average

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