The average of 8 numbers is 30. If one number is 40, find the average of the remaining 7. MCQ with Answer and Explanation

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The average of 8 numbers is 30. If one number is 40, find the average of the remaining 7.

A. 28

B. 29

C. 27.5

D. 28.57

Answer: Option D

Solution (By JKExamLibrary)

Sum=8×30=240. Remaining sum=240-40=200. Avg=200/7=28.57.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 25 numbers 70. If average of 15 is 75, average of remaining 10?

A. 63

B. 62.5

C. 60

D. 65

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Correct Answer: Option B

Explanation:
Total=1750. Sum15=1125. Remaining=625/10=62.5.

This question belongs to: Maths Average

Question #2 Report Error

The average of 3 numbers is 12. If the first is 10 and the second is 15, find the third.

A. 12

B. 9

C. 13

D. 11

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Correct Answer: Option D

Explanation:
Sum=3×12=36. Third=36-10-15=11.

This question belongs to: Maths Average

Question #3 Report Error

Average of 20 numbers 120. If average of 12 is 115, average of remaining 8?

A. 126

B. 127.5

C. 130

D. 125

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Correct Answer: Option B

Explanation:
Sum20=2400. Sum12=1380. Remaining=1020. Average=127.5.

This question belongs to: Maths Average

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