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

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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. 38

C. 39

D. 42

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Average

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Question #1

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Average of 15 numbers 1760. If average of 9 is 1755, average of remaining 6?

A. 1770

B. 1768

C. 1765

D. 1767.5

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Correct Answer: Option D

Explanation:
Sum15=26400. Sum9=15795. Remaining=10605. Average=1767.5.

This question belongs to: Maths Average

Question #2

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Average of 8 numbers 2250. If average of 5 is 2245, average of remaining 3?

A. 2255

B. 2257

C. 2258.33

D. 2260

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Correct Answer: Option C

Explanation:
Sum8=18000. Sum5=11225. Remaining=6775. Average≈2258.33.

This question belongs to: Maths Average

Question #3

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Average of 10 numbers 630. If average of 6 is 625, average of remaining 4?

A. 636

B. 637.5

C. 635

D. 640

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Correct Answer: Option B

Explanation:
Sum10=6300. Sum6=3750. Remaining=2550. Average=637.5.

This question belongs to: Maths Average

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