Question

In three class rooms of a school there are 124 boys the number in the first and second being in the ratio of 2 ratio 3 and there in the second and third in 7 ratio 9 the number of boys in each classroom are

Answer 1

The answer is given below

Answer 2

2 : 3
7 : 9
14 :21 :27
first :second :third

let x is in the ratio.
no of boys in first class = 14x
no of boys in second class =21x
no of boys in third class =27x
then 14x +21x +27x = 124
=62x =124
so x =2