Question 45

The average weight of 8 persons increases by 2.5 kg when a new persons comes in place of one of them weighing 65 kg. The weight of the new person is

Solution

Let average weight of 8 persons = $$x$$ kg and weight of new person = $$y$$ kg

=> Sum of weights of persons = $$8x$$ kg

According to ques,

=> $$\frac{8x-65+y}{8}=x+2.5$$

=> $$8x-65+y=8x+20$$

=> $$y=20+65=85$$

$$\therefore$$ The weight of the new person = 85 kg

=> Ans - (B)

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