Question

The number of boys and girls in a class in the ratio 7:5 the number of boys is 8 more than the number o's girls what is the total strenth

Answer 1

boys=girls+8
boys=7x,girls=5x
7x=5x+8
7x-5x=8
2x=8
x=8/2
x=4
boys=7x
=7(4)=28
girls=5x
5(4)=20
total=28+20=48 is answer obtained

Answer 2

b:g = 7:5
boys = 5x + 8
lets boys & girls = 7x, 5x
so 7x+5x = 12x = 8+5x+5x
2x = 8
x = 4

than boys = 7x = 28 and
girls = 5x+8 = 5×4+8 = 28