Average of 30 numbers 20. If each decreased by 4, new average? MCQ with Answer and Explanation

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Average of 30 numbers 20. If each decreased by 4, new average?

A. 16

B. 24

C. 20

D. 18

Answer: Option A

Solution (By JKSSB Mock Tests)

16.

This question belongs to: Maths Average

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Question #1

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Average of 12 numbers 1920. If average of 8 is 1915, average of remaining 4?

A. 1932

B. 1930

C. 1928

D. 1925

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Correct Answer: Option B

Explanation:
Sum12=23040. Sum8=15320. Remaining=7720. Average=1930.

This question belongs to: Maths Average

Question #2

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The average of first 20 natural numbers is

A. 10.5

B. 9.5

C. 10

D. 11

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Correct Answer: Option A

Explanation:
(20+1)/2=10.5.

This question belongs to: Maths Average

Question #3

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Average of 12 numbers 55. If average of 8 is 50, average of remaining 4?

A. 65

B. 62.5

C. 60

D. 70

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Correct Answer: Option A

Explanation:
Sum12=660. Sum8=400. Remaining=260. Average=65.

This question belongs to: Maths Average

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