French, asked by dainvincible1, 1 year ago

The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?

Answers

Answered by Anonymous
17
The answer is 85kg.

Solution:-
Let x be the average weight

Case-1
Sum of weights of people / 8 people = x
So the sum of weights of people = 8x .......1

Case-2
Sum of weights of people / 8 people = x + 2.5
So the sum of weights of people here is 8(x + 2.5) = 8x + 20 ......2

Subtracting 1 from 2,we get;
8x + 20 - 8x = 20

So weight of the new guy is 20kg more than the previous guy.
Hence,new guy weighs: 65 + 20 = 85kg

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