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. 16

B. 20

C. 18

D. 15

Answer: Option C

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

A. 407

B. 405

C. 410

D. 408.33

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #2

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Average of 1475,2950 is

A. 2210

B. 2212.5

C. 2220

D. 2200

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Correct Answer: Option B

Explanation:
2212.5.

This question belongs to: Maths Average

Question #3

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Average of 9 numbers 1740. If average of 6 is 1735, average of remaining 3?

A. 1745

B. 1755

C. 1750

D. 1748

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Correct Answer: Option C

Explanation:
Sum9=15660. Sum6=10410. Remaining=5250. Average=1750.

This question belongs to: Maths Average

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