The average of 8 numbers is 25. If 5 is added to each of first 4 and subtracted from each of last 4, new average? MCQ with Answer and Explanation

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The average of 8 numbers is 25. If 5 is added to each of first 4 and subtracted from each of last 4, new average?

A. 25

B. 27

C. 26

D. 24

Answer: Option A

Solution (By JKSSB Mock Tests)

Net zero change. Average remains 25.

This question belongs to: Maths Average

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Question #1

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Average of 25 students marks 80. If 5 students average 90, average of remaining 20?

A. 76

B. 77.5

C. 75

D. 78

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Correct Answer: Option B

Explanation:
Total=2000. 5=450. Remaining=1550/20=77.5.

This question belongs to: Maths Average

Question #2

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The average weight of 8 students is 42 kg. If a new student joins, the average becomes 44 kg. What is the weight of the new student?

A. 62 kg

B. 58 kg

C. 56 kg

D. 60 kg

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Correct Answer: Option D

Explanation:
Sum of 8 =8×42=336. Sum of 9 =9×44=396. New student's weight =396-336=60.

This question belongs to: Maths Average

Question #3

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The average weight of 6 boys is 50 kg. If a new boy weighing 60 kg joins, what is the new average?

A. 51 kg

B. 52 kg

C. 50.5 kg

D. 51.43 kg

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Correct Answer: Option D

Explanation:
Sum=6×50=300. New sum=300+60=360. New avg=360/7=51.43.

This question belongs to: Maths Average

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