The average weight of 8 persons increases by 2.5 kg when one person weighing 65 kg is replaced by a new person. What is the weight of the new person? MCQ with Answer and Explanation

Question

The average weight of 8 persons increases by 2.5 kg when one person weighing 65 kg is replaced by a new person. What is the weight of the new person?

A. 90

B. 80

C. 75

D. 85

Answer: Option D

Solution (By JKSSB Mock Tests)

Increase in total weight = 8 × 2.5 = 20 kg. New person weight = 65 + 20 = 85 kg.

This question belongs to: Maths Average

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Question #1

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Average of 100 numbers is 50. If 50 is added to each, new average is

A. 150

B. 50

C. 75

D. 100

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Correct Answer: Option D

Explanation:
New average =50 +50=100.

This question belongs to: Maths Average

Question #2

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Average of 8 observations is 40. If two observations 30 and 50 are included, new average?

A. 42

B. 39

C. 40

D. 41

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Correct Answer: Option C

Explanation:
Sum8=320. New sum=320+80=400. Numbers10. Average=40.

This question belongs to: Maths Average

Question #3

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Average of 40 numbers 30. If 10 numbers average 40, average of remaining 30?

A. 26.67

B. 25

C. 27

D. 28

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Correct Answer: Option A

Explanation:
Total=1200. 10=400. Remaining=800/30≈26.67.

This question belongs to: Maths Average

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