Question

In math class, the girl to boy ratio is 3 to 9.

If there are 15 girls, how many boys are there?

Answer 1

http://www.purplemath.com/modules/ratio.htm

Answer 2

Set up a proportion of girls to boys
\(\large\frac{3}{9}=\frac{15}{b}\)
Solve for b

Answer 3

15/3=5
so 9*5=45boys

Answer 4

thx