The average of 12 numbers is 15. If each number is multiplied by 2 and then 3 is added, what is the new average? MCQ with Answer and Explanation

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The average of 12 numbers is 15. If each number is multiplied by 2 and then 3 is added, what is the new average?

A. 27

B. 30

C. 33

D. 36

Answer: Option C

Solution (By JKSSB Mock Tests)

New average = (old average ×2)+3 = (15×2)+3=33.

This question belongs to: Maths Average

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Question #1

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A person covers 2/3 distance at 30 km/h and 1/3 at 60 km/h. Average speed?

A. 45 km/h

B. 35 km/h

C. 36 km/h

D. 40 km/h

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Correct Answer: Option C

Explanation:
Let distance 3d. Time = (2d/30) + (d/60) = (4d + d)/60 =5d/60. Average =3d / (5d/60) =36.

This question belongs to: Maths Average

Question #2

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

A. 9

B. 12

C. 10

D. 8

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Correct Answer: Option A

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

This question belongs to: Maths Average

Question #3

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

A. 30

B. 24

C. 21

D. 27

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Correct Answer: Option D

Explanation:
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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