Question

The ratio of boys to girls in a class room is 5 to 7. If there are 30 boys then how many girls are there

Answer 1

Answer:

The ratio of boys to girls to 5:7

Let the number of boys be 5x

Let the number of girls be 7x

5x = 30

x = 6

Now just plug in 6 for the x in 7x

and number of girls 7 x 6 = 42

Answer 2

The answer would be 42 girls