Average of 9,18,27,36,45 is MCQ with Answer and Explanation

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Average of 9,18,27,36,45 is

A. 25

B. 27

C. 28

D. 30

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum=135. Average=27.

This question belongs to: Maths Average

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Question #1

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

A. 12

B. 10

C. 9

D. 8

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Correct Answer: Option C

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

This question belongs to: Maths Average

Question #2

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Average of 25 numbers 40. If average of first 13 is 38, average of last 13 is 42, what is the 13th number?

A. 40

B. 42

C. 38

D. 39

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Correct Answer: Option A

Explanation:
Sum25=1000. Sum1-13=494. Sum13-25=546. 13th=494+546-1000=40.

This question belongs to: Maths Average

Question #3

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Average of 20 numbers 120. If average of 12 is 115, average of remaining 8?

A. 125

B. 126

C. 130

D. 127.5

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Correct Answer: Option D

Explanation:
Sum20=2400. Sum12=1380. Remaining=1020. Average=127.5.

This question belongs to: Maths Average

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