If average of 25 students is 50 and average of 15 is 60, average of remaining 10? MCQ with Answer and Explanation

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If average of 25 students is 50 and average of 15 is 60, average of remaining 10?

A. 35

B. 40

C. 45

D. 30

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum25=1250. Sum15=900. Remaining sum=350. Average=35.

This question belongs to: Maths Average

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Question #1

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The average of 12 numbers is 40. Later average becomes 42 when two numbers are changed. The difference in sum?

A. 24

B. 30

C. 28

D. 20

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Correct Answer: Option A

Explanation:
Increase in average 2, for 12 =24 increase in sum.

This question belongs to: Maths Average

Question #2

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Average of 15 numbers 95. If average of 9 is 90, average of remaining 6?

A. 105

B. 98

C. 102.5

D. 100

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Correct Answer: Option C

Explanation:
Sum15=1425. Sum9=810. Remaining=615. Average=102.5.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers 1510. If average of 9 is 1505, average of remaining 6?

A. 1518

B. 1515

C. 1520

D. 1517.5

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Correct Answer: Option D

Explanation:
Sum15=22650. Sum9=13545. Remaining=9105. Average=1517.5.

This question belongs to: Maths Average

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