The average weight of the 8 oarsmen in boat is increased

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The average weight of the 8 oarsmen in boat is increased by 1¹/₂ kg when one of the crew who weighs 60 kg is replaced by a new man. The weight of the new man (in kg) is

According to question ,

Weight of the new oarsman = 60 + 8 ×	3
	2

Weight of the new oarsman = 60 + 12 = 72 kg
Second method to solve this question with the help of given formula :

Here, N = 8, T = 60, t =	3
	2

Weight of new man = T + Nt

Weight of new man = 60 + 8 ×	3
	2

Weight of new man = 60 + 12 = 72