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Quantitative Aptitude

Averages

The average w...

Question

The average weight of 20 students in a class is 48 Kg. One more person joins the class and the average weight increases by 1 Kg. What is the weight of the new joiner?

A

49 Kg

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B

54 kg

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C

68 Kg

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D

69 Kg

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Solution

The correct option is D 69 Kg
Sum of weights of 20 students initially $= 20 \times 48 = 960$ Kg
Sum of weights after 1 more person joined $= 21 \times 49 = 1029$
Weight of the new joiner = 1029-960 = 69 Kg

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