Question

The ratio of boys to girls in a classroom is 3:5 If there are 35 girls

in the class, how many boys are in the classroom?

Answer 1

Boys to girls

3 : 5

? : 35

35/5 = 7

5 x 7 gives number of girls.

So, 3 x 7 will give number of boys, which is 21

Thus, there are 21 boys

(basically, you find the number you multiplied by 5 to get 35, then, multiplying that number on the other side, which was 3 in this case. )

Hope this helps!