Question

If there are 2 boys for every 3 girls in a class of 35 how many boys are there

Answer 1

14 Because if there are 7 groups of 3 girls that equals 21 then 2boys times 7 is 14 and 14+21=35

Answer 2

Set up a proportion:

In a sample of 2:3, you have 5 kids in all.

So the the ratio of boys to kids in a sample of 5 is 2:5.

So set up a proportion:

$\frac{2}{5}$ = $\frac{x}{35}$

5x = 70

x = 14

Therefore, there are 14 boys in all.