Average of 30 numbers 55. If average of 20 is 50, average of remaining 10? MCQ with Answer and Explanation

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Average of 30 numbers 55. If average of 20 is 50, average of remaining 10?

A. 70

B. 62

C. 65

D. 60

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum30=1650. Sum20=1000. Remaining=650. Average=65.

This question belongs to: Maths Average

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Question #1

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

A. 25

B. 100

C. 50

D. 75

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Correct Answer: Option B

Explanation:
New average =100.

This question belongs to: Maths Average

Question #2

Average of 12 numbers 520. If average of 8 is 515, average of remaining 4?

A. 525

B. 528

C. 530

D. 532

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Correct Answer: Option C

Explanation:
Sum12=6240. Sum8=4120. Remaining=2120. Average=530.

This question belongs to: Maths Average

Question #3

Average of 4 consecutive numbers is 49.5. Largest number?

A. 51

B. 52

C. 49

D. 50

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Correct Answer: Option A

Explanation:
Average middle of 2nd 3rd 49.5. Largest=49.5+1.5=51.

This question belongs to: Maths Average

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