If average of 15 numbers is 50 and average of 5 is 55, average of remaining 10? MCQ with Answer and Explanation

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If average of 15 numbers is 50 and average of 5 is 55, average of remaining 10?

A. 50

B. 48

C. 45

D. 47.5

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum15=750. Sum5=275. Remaining=475. Average=47.5.

This question belongs to: Maths Average

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Question #1

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The average age of 4 boys is 16 years. If their ages are in ratio 1:2:3:4, what is the age of the oldest boy?

A. 28

B. 26

C. 24

D. 25.6 years

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Correct Answer: Option D

Explanation:
Sum =4×16=64. Ratio sum=10. Oldest = (4/10)×64 =25.6.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 2670. If average of 8 is 2665, average of remaining 4?

A. 2678

B. 2675

C. 2680

D. 2682

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Correct Answer: Option C

Explanation:
Sum12=32040. Sum8=21320. Remaining=10720. Average=2680.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers 25. If each increased by 3, new average?

A. 25

B. 28

C. 26

D. 27

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Correct Answer: Option B

Explanation:
New average =25+3=28.

This question belongs to: Maths Average

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