If average of 15 numbers is 40 and one number 50 is replaced by 30, new average? MCQ with Answer and Explanation

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If average of 15 numbers is 40 and one number 50 is replaced by 30, new average?

A. 39

B. 41

C. 38

D. 40

Answer: Option A

Solution (By JKSSB Mock Tests)

Change -20, decrease 20/15≈1.33, new≈38.67 approx but use exact.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Average of 8 numbers 32. If average of 3 is 28, average of remaining 5?

A. 33

B. 34.4

C. 35

D. 36

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Correct Answer: Option B

Explanation:
Sum8=256. Sum3=84. Remaining=172. Average=34.4.

This question belongs to: Maths Average

Question #2

Average of 9 numbers 1390. If average of 6 is 1385, average of remaining 3?

A. 1395

B. 1400

C. 1398

D. 1405

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Correct Answer: Option B

Explanation:
Sum9=12510. Sum6=8310. Remaining=4200. Average=1400.

This question belongs to: Maths Average

Question #3

The average of 1 to 30 is

A. 16

B. 14.5

C. 15

D. 15.5

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Correct Answer: Option D

Explanation:
(30+1)/2=15.5.

This question belongs to: Maths Average

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