If average of 8 and 12 is 10 and average of 12 and x is 15, x is MCQ with Answer and Explanation

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If average of 8 and 12 is 10 and average of 12 and x is 15, x is

A. 20

B. 15

C. 16

D. 18

Answer: Option D

Solution (By JKSSB Mock Tests)

12 + x =30. x=18.

This question belongs to: Maths Average

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Question #1

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Average of 15 numbers 1010. If average of 9 is 1005, average of remaining 6?

A. 1018

B. 1020

C. 1017.5

D. 1015

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Correct Answer: Option C

Explanation:
Sum15=15150. Sum9=9045. Remaining=6105. Average=1017.5.

This question belongs to: Maths Average

Question #2

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The average of 12 numbers is 18. If each number is increased by 5, what is the new average?

A. 28

B. 23

C. 18

D. 13

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Correct Answer: Option B

Explanation:
New average =18+5=23.

This question belongs to: Maths Average

Question #3

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The average of 390,520,650 is

A. 530

B. 520

C. 515

D. 510

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Correct Answer: Option B

Explanation:
1560/3=520.

This question belongs to: Maths Average

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