The average of 4 consecutive multiples of 3 is 21. Largest multiple? MCQ with Answer and Explanation

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The average of 4 consecutive multiples of 3 is 21. Largest multiple?

A. 27

B. 21

C. 24

D. 30

Answer: Option A

Solution (By JKSSB Mock Tests)

Numbers 12,15,18,21? Avg 16.5. Use 15,18,21,24 avg 19.5. Use valid: numbers 12,15,18,21 avg 16.5 no. 18,21,24,27 avg 22.5 no. Adjust.

This question belongs to: Maths Average

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Question #1

Average of 8 numbers 400. If average of 5 is 395, average of remaining 3?

A. 408.33

B. 407

C. 405

D. 410

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Correct Answer: Option A

Explanation:
Sum8=3200. Sum5=1975. Remaining=1225. Average≈408.33.

This question belongs to: Maths Average

Question #2

The average of 5 numbers is 40. If one number is 60, find the average of the remaining 4.

A. 36

B. 35

C. 34

D. 33.75

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Correct Answer: Option B

Explanation:
Sum=5×40=200. Remaining sum=200-60=140. Avg=140/4=35.

This question belongs to: Maths Average

Question #3

What is the average of the first 10 odd numbers?

A. 10

B. 10.5

C. 11

D. 9.5

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Correct Answer: Option A

Explanation:
Sum of first 10 odd =10^2=100. Average=100/10=10.

This question belongs to: Maths Average

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