What is the average of the first 5 multiples of 3? MCQ with Answer and Explanation

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What is the average of the first 5 multiples of 3?

A. 9

B. 12

C. 10

D. 8

Answer: Option A

Solution (By JKSSB Mock Tests)

Multiples: 3,6,9,12,15 sum=45, average=45/5=9.

This question belongs to: Maths Average

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Question #1

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Average of 15 numbers 360. If average of 9 is 355, average of remaining 6?

A. 368

B. 370

C. 367.5

D. 365

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Correct Answer: Option C

Explanation:
Sum15=5400. Sum9=3195. Remaining=2205. Average=367.5.

This question belongs to: Maths Average

Question #2

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The average age of 4 boys is 16 years. If their ages are in ratio 1:2:3:4, what is the age of the oldest boy?

A. 28

B. 26

C. 25.6 years

D. 24

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Correct Answer: Option C

Explanation:
Sum =4×16=64. Ratio sum=10. Oldest = (4/10)×64 =25.6.

This question belongs to: Maths Average

Question #3

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Average of 10 to 50 is

A. 32

B. 30

C. 31

D. 29

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Correct Answer: Option B

Explanation:
(10+50)/2=30.

This question belongs to: Maths Average

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