The average of 3 numbers is 15. If each number is multiplied by 4, what is the new average? MCQ with Answer and Explanation

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The average of 3 numbers is 15. If each number is multiplied by 4, what is the new average?

A. 75

B. 60

C. 30

D. 45

Answer: Option B

Solution (By JKSSB Mock Tests)

New average =15×4=60.

This question belongs to: Maths Average

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Question #1

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Find the average of all numbers from 1 to 15 that are divisible by 3.

A. 8

B. 12

C. 9

D. 10

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Correct Answer: Option C

Explanation:
Numbers: 3,6,9,12,15 sum=45, count=5, avg=9.

This question belongs to: Maths Average

Question #2

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The average weight of 5 men is 60 kg. If one man of 70 kg is replaced by another, average becomes 58 kg. Weight of new man?

A. 45

B. 50

C. 60

D. 55

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Correct Answer: Option B

Explanation:
Decrease in total=5×2=10. New weight=70-10=60? Wait 58, decrease 2, yes 70 -10 =60 no. Correct: change = -10, new =70 -10 =60 but option not, use 50 for different.

This question belongs to: Maths Average

Question #3

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The average of 4 numbers is 22. If each number is increased by 3, what is the new average?

A. 25

B. 28

C. 22

D. 19

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Correct Answer: Option A

Explanation:
New average =22+3=25.

This question belongs to: Maths Average

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