Question

There are 3 boys more than the number of girls in a chess club. A member of the club is to be chosen at random to participate in a tournament. Each member is equally likely to be chosen. If the probability that a girl is chosen is 2/7 then how many girls and boys are there in the club

Answer 1

Total no. of girls=2
Total no. of boys=5

Answer 2

Hope this helps you...
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Total boys=7-2=5
Girls = 2 (given)