the average weight of a group of boys is 30 kg. after a boy of weight 35 kg jo

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the average weight of a group of boys is 30 kg. after a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. find the number of boys in the group originally ?

Options:

A . 4

B . 5

C . 6

D . 7

Answer: Option A
Explanation :

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