The average of 2 numbers is 15. If one number is 10, what is the other? MCQ with Answer and Explanation

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The average of 2 numbers is 15. If one number is 10, what is the other?

A. 15

B. 25

C. 20

D. 5

Answer: Option C

Solution (By JKSSB Mock Tests)

Sum =2×15=30. Other =30-10=20.

This question belongs to: Maths Average

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Question #1

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The average of 5 numbers is 33. If each number is decreased by 2, what is the new average?

A. 33

B. 31

C. 35

D. 29

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Correct Answer: Option B

Explanation:
New average =33-2=31.

This question belongs to: Maths Average

Question #2

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Average of 8 numbers 2750. If average of 5 is 2745, average of remaining 3?

A. 2757

B. 2755

C. 2758.33

D. 2760

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Correct Answer: Option C

Explanation:
Sum8=22000. Sum5=13725. Remaining=8275. Average≈2758.33.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers 2360. If average of 9 is 2355, average of remaining 6?

A. 2368

B. 2367.5

C. 2365

D. 2370

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Correct Answer: Option B

Explanation:
Sum15=35400. Sum9=21195. Remaining=14205. Average=2367.5.

This question belongs to: Maths Average

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