Average of 20 numbers 50. If each number is doubled, new average? MCQ with Answer and Explanation

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Average of 20 numbers 50. If each number is doubled, new average?

A. 50

B. 75

C. 25

D. 100

Answer: Option D

Solution (By JKSSB Mock Tests)

New average =100.

This question belongs to: Maths Average

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Question #1

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Average of 1485,1980,2475 is

A. 1980

B. 1970

C. 1975

D. 1990

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Correct Answer: Option A

Explanation:
5940/3=1980.

This question belongs to: Maths Average

Question #2

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Average of first 20 multiples of 5 is

A. 52.5

B. 60

C. 50

D. 55

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #3

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The average of 7 consecutive integers starting from n is 25. What is n?

A. 24

B. 21

C. 23

D. 22

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Correct Answer: Option D

Explanation:
Average = n+3 =25. n=22.

This question belongs to: Maths Average

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