Question

the average weight of 50 boys is 60 kg if the boys with 90 kg weight replied by boys with weight 40 kg what is will be releasing of average

Answer 1

let the sum of weight of boys be X
X/50=60
X=50*60
X=3000kg
if a boy has 90 kg weight and he is replaced by a boy with 40 kg weight then it is a decrease of 50 kg in total weight.
so, let the new weight be X'
X'=2950 kg
avg=2950/50
avg= 59kg
hope it helps
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