The average weight of the 8 oarsmen in boat is increased by 1$1/2$ kg when one o

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Question

The average weight of the 8 oarsmen in boat is increased by 1$1/2$ kg when one of the crew who weighs 60kg is replaced by a new man. The weight of the new man (in kg) is

Options:

A . 68 kg

B . 70 kg

C . 72 kg

D . 71 kg

Answer: Option C
Answer: (c)Weight of the new oarsman = 60 + 8 × $3/2$ = 60 + 12 = 72 kg Aliter : Using Rule 18, Here, N = 8, T = 60, t = $3/2$ Weight of new man = T + Nt = 60 + 8 × $3/2$ = 60 + 12 = 72

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