A library has average 120 books per shelf for 10 shelves. If one shelf has 150, what is average of remaining? MCQ with Answer and Explanation

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A library has average 120 books per shelf for 10 shelves. If one shelf has 150, what is average of remaining?

A. 120

B. 116.67

C. 118

D. 115

Answer: Option B

Solution (By JKSSB Mock Tests)

Total=1200. Remaining=1050 for 9. 1050/9≈116.67.

This question belongs to: Maths Average

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Question #1

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Average of 8 numbers 1100. If average of 5 is 1095, average of remaining 3?

A. 1110

B. 1108.33

C. 1105

D. 1107

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Correct Answer: Option B

Explanation:
Sum8=8800. Sum5=5475. Remaining=3325. Average≈1108.33.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 570. If average of 8 is 565, average of remaining 4?

A. 582

B. 580

C. 575

D. 578

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Correct Answer: Option B

Explanation:
Sum12=6840. Sum8=4520. Remaining=2320. Average=580.

This question belongs to: Maths Average

Question #3

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The average of 8 numbers is 26. If one number is 30, find the average of the remaining 7.

A. 25.5

B. 25.43

C. 26

D. 24.86

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Correct Answer: Option B

Explanation:
Sum=8×26=208. Remaining sum=208-30=178. Avg=178/7=25.43.

This question belongs to: Maths Average

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