The average weight of 30 persons is increased by 2 kg when one of them, whose weight is 40 kg, is replaced by a new person. What is the weight of the new person?

A98 kg

B100 kg ✓ Correct

C102 kg

D95 kg

Correct answer: (B) 100 kg

Explanation

The new person weighs 100 kg.

Replacing raises the average by 2 kg over 30 persons.

Total weight rises by 30 x 2 = 60 kg.

New weight = old 40 + 60.

So the new person is 100 kg.

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