Question

80 girls and boys have planned for a movie. the are in a ratio of 6 girls to 2 boys. how many girls are there?

Answer 1

total no.of children=80
the ratio of girls to boys=6:2
no.of girls=6x
no.of boys=2x
6x+2x=80
8x=80,x=10
so,the actual no.of girls =6*x=60
and the no.of boys=2*x=20

Answer 2

Let x be the number of girls.
Let 80-x be the number of boys.

Girls:boys = 6:2
x:80-x = 6:2
x/80-x = 6/2
x/80-x = 3
x = 240 - 3x
4x = 240
x = 60
Number of girls = 60
Number of boys = 80-60 = 20