Question

in a class the ration of boys and girls is 7:5 and boys are 8 more than the girls, what is the total strength of the class

Answer 1

Let the number of girls be a

Number of boys = a + 8

Now,

Number of boys / Number of girls = 7 / 5

=> (a +8) / a = 7 /5

=> 5a + 40 = 7a

=> 40 = 7a - 5a

=> 2a = 40

=> a = 20

Number of girls = 20

Number of boys = 20 + 8 = 28

Total strength = 20 + 28 = 48

Answer 2

hope it's helpful........