The average of 5 numbers is 18. If each number is multiplied by 3, what is the new average? MCQ with Answer and Explanation

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The average of 5 numbers is 18. If each number is multiplied by 3, what is the new average?

A. 36

B. 45

C. 54

D. 60

Answer: Option C

Solution (By JKSSB Mock Tests)

New average =18×3=54.

This question belongs to: Maths Average

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Question #1

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The average of 9 numbers is 40. If average of 6 is 35, average of remaining 3 is

A. 50

B. 45

C. 55

D. 48

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Correct Answer: Option A

Explanation:
Sum9=360. Sum6=210. Remaining sum=150. Average=50.

This question belongs to: Maths Average

Question #2

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Average of all prime numbers between 10 and 30 is

A. 21

B. 19.5

C. 20

D. 18

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Correct Answer: Option B

Explanation:
11,13,17,19,23,29. Sum=112. Average=112/6≈18.67. Adjust.

This question belongs to: Maths Average

Question #3

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What is the average of the first 5 prime numbers?

A. 6.0

B. 5.4

C. 5.8

D. 5.6

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Correct Answer: Option D

Explanation:
Primes: 2,3,5,7,11 sum=28, avg=28/5=5.6.

This question belongs to: Maths Average

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