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

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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. 60 kg

B. 61 kg

C. 58.95 kg

D. 59 kg

Answer: Option C

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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The average of 1260,1680,2100 is

A. 1675

B. 1680

C. 1670

D. 1690

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Correct Answer: Option B

Explanation:
5040/3=1680.

This question belongs to: Maths Average

Question #2

The average height of 4 boys is 1.5 m. If a girl of height 1.6 m joins, what is the new average?

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B. 1.55 m

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Correct Answer: Option C

Explanation:
Sum of 4 =4×1.5=6.0. Sum of 5=6.0+1.6=7.6. Average=7.6/5=1.52.

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Question #3

Average of 9 numbers 1590. If average of 6 is 1585, average of remaining 3?

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