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. 60

C. 54

D. 45

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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Average of 9 numbers 690. If average of 6 is 685, average of remaining 3?

A. 705

B. 695

C. 700

D. 698

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Correct Answer: Option C

Explanation:
Sum9=6210. Sum6=4110. Remaining=2100. Average=700.

This question belongs to: Maths Average

Question #2

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The average age of 8 students is 15 years. If the teacher's age is included, the average becomes 18 years. What is the teacher's age?

A. 42

B. 45

C. 39

D. 40

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Correct Answer: Option A

Explanation:
Total age of students = 8×15 = 120. Total age including teacher = 9×18 = 162. Teacher's age = 162−120 = 42.

This question belongs to: Maths Average

Question #3

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Average of 1125,1500,1875 is

A. 1500

B. 1510

C. 1490

D. 1495

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Correct Answer: Option A

Explanation:
4500/3=1500.

This question belongs to: Maths Average

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