The average of 25 numbers is 40. If the average of first 15 numbers is 38, what is the average of the remaining 10 numbers? MCQ with Answer and Explanation

Question

The average of 25 numbers is 40. If the average of first 15 numbers is 38, what is the average of the remaining 10 numbers?

A. 44

B. 41

C. 43

D. 42

Answer: Option C

Solution (By JKSSB Mock Tests)

Total of 25 numbers = 1000. Total of first 15 = 570. Remaining total = 430. Average = 430/10 = 43.

This question belongs to: Maths Average

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Question #1

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Find the average of the first 5 multiples of 7.

A. 19.5

B. 21

C. 20

D. 22

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Correct Answer: Option B

Explanation:
Multiples:7,14,21,28,35 sum=105, count=5, avg=21.

This question belongs to: Maths Average

Question #2

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Average of 10 numbers 2630. If average of 6 is 2625, average of remaining 4?

A. 2636

B. 2640

C. 2637.5

D. 2635

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Correct Answer: Option C

Explanation:
Sum10=26300. Sum6=15750. Remaining=10550. Average=2637.5.

This question belongs to: Maths Average

Question #3

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The average of 3 numbers is 18. If two of the numbers are 15 and 20, find the third number.

A. 17

B. 20

C. 18

D. 19

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Correct Answer: Option D

Explanation:
Sum of 3 numbers = 3×18=54. Sum of two =15+20=35. Third =54-35=19.

This question belongs to: Maths Average

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