Average of first 20 multiples of 5 is MCQ with Answer and Explanation

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Average of first 20 multiples of 5 is

A. 55

B. 60

C. 50

D. 52.5

Answer: Option D

Solution (By JKSSB Mock Tests)

5 to 100. Average 5*(1+20)/2 =5*10.5=52.5.

This question belongs to: Maths Average

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Question #1

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Average of 15 numbers 2460. If average of 9 is 2455, average of remaining 6?

A. 2467.5

B. 2470

C. 2468

D. 2465

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Correct Answer: Option A

Explanation:
Sum15=36900. Sum9=22095. Remaining=14805. Average=2467.5.

This question belongs to: Maths Average

Question #2

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The average of 10 numbers is 16. If each number is increased by 4, what is the new average?

A. 16

B. 12

C. 20

D. 24

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Correct Answer: Option C

Explanation:
New average =16+4=20.

This question belongs to: Maths Average

Question #3

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Average of 8 numbers 500. If average of 5 is 495, average of remaining 3?

A. 507

B. 510

C. 508.33

D. 505

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Correct Answer: Option C

Explanation:
Sum8=4000. Sum5=2475. Remaining=1525. Average≈508.33.

This question belongs to: Maths Average

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