Juans class has 10 girls and 15 boys. The ratio of girls to boys in Steven's class is the same as the ratio of girls to juans class. There are 21 boys in stevens class. Write a proportion that can be used to find the number of girls, g, im stevens class.

J=15b/10g

S=21b/g w / the ratio 3/2 (15/10=3/2)

1) Form an equation (21/g=3/2).

2) Since you are trying to find the denominator, multiply 3/2 so that the numerators are the same (3*7=21 2*7=14).

3) The answer will be whatever the denominator is at the end.

The answer is there are 14 girls in Steven's class.