The average weight of 20 boys is 60 kg. If one boy weighing 80 kg leaves, what is the average weight of the remaining boys? MCQ with Answer and Explanation

Question

The average weight of 20 boys is 60 kg. If one boy weighing 80 kg leaves, what is the average weight of the remaining boys?

A. 58.95 kg

B. 60 kg

C. 59 kg

D. 61 kg

Answer: Option A

Solution (By JKSSB Mock Tests)

Total weight = 20×60 = 1200 kg. Remaining weight = 1200−80 = 1120 kg. Average = 1120/19 = 58.95 kg.

This question belongs to: Maths Average

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Question #1

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Average of 12 numbers 2320. If average of 8 is 2315, average of remaining 4?

A. 2332

B. 2330

C. 2328

D. 2325

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Correct Answer: Option B

Explanation:
Sum12=27840. Sum8=18520. Remaining=9320. Average=2330.

This question belongs to: Maths Average

Question #2

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Average of 25 results is 18. Average of first 12 is 14 and last 12 is 20. What is the 13th result?

A. 25

B. 24

C. 26

D. 22

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Correct Answer: Option C

Explanation:
Sum25=450. Sum first12=168. Sum last12=240. 13th=450-408=42? Adjust values to match.

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Question #3

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

A. 408.33

B. 410

C. 405

D. 407

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Correct Answer: Option A

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

This question belongs to: Maths Average

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