The average of 6, 12, 18, 24, 30 is MCQ with Answer and Explanation

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The average of 6, 12, 18, 24, 30 is

A. 22

B. 15

C. 18

D. 20

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum=90. Average=18.

This question belongs to: Maths Average

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Question #1

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Average of 15 numbers 910. If average of 9 is 905, average of remaining 6?

A. 915

B. 918

C. 917.5

D. 920

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Correct Answer: Option C

Explanation:
Sum15=13650. Sum9=8145. Remaining=5505. Average=917.5.

This question belongs to: Maths Average

Question #2

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Average of 30 numbers 25. If each number is increased by 10%, new average?

A. 25

B. 27.5

C. 30

D. 26

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Correct Answer: Option B

Explanation:
Increased by 10%, average 27.5.

This question belongs to: Maths Average

Question #3

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The average of three numbers is 45. If two numbers are 40 and 50, the third number is:

A. 45

B. 50

C. 55

D. 40

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Correct Answer: Option A

Explanation:
Total of three numbers = 3×45 = 135. Third number = 135−40−50 = 45.

This question belongs to: Maths Average

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