Average of 10 numbers 630. If average of 6 is 625, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 630. If average of 6 is 625, average of remaining 4?

A. 635

B. 636

C. 637.5

D. 640

Answer: Option C

Solution (By JKExamLibrary)

Sum10=6300. Sum6=3750. Remaining=2550. Average=637.5.

This question belongs to: Maths Average

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Question #1 Report Error

The average of 10 numbers is 21. If one number is 30, find the average of the remaining 9.

A. 20

B. 20.5

C. 19.5

D. 19

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Correct Answer: Option A

Explanation:
Sum=10×21=210. Remaining sum=210-30=180. Avg=180/9=20.

This question belongs to: Maths Average

Question #2 Report Error

The average of 7 numbers is 29. If each number is multiplied by 3, what is the new average?

A. 58

B. 87

C. 86

D. 29

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Correct Answer: Option B

Explanation:
New average =29×3=87.

This question belongs to: Maths Average

Question #3 Report Error

If average of x numbers is y and average of z numbers is w, combined average is

A. (y + w)/2

B. x y + z w

C. (x y + z w)/(x+z)

D. (x + z) y / (x + z)

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Correct Answer: Option C

Explanation:
Weighted average formula: (x*y + z*w) / (x + z).

This question belongs to: Maths Average

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