Question

The ratio of girls to students at a middle school is 10 to 18. If there are 270 students at the school, how many are girls?
100
150
180
200
(I believe its 150, but I'm not sure. It'll be awesome if you can explain how to do this also)

Answer 1

A good way of doing this problem would be to use cross multiplication of ratios
$\frac{10 girls}{18 students} = \frac{X girls}{270 students}$

Then cross multiply

(10 girls)(270 students)=(X girls)(18 students)

2700=18x
150=x

Answer 2

10/18 = 0.5555 = 55.6%

0.556  ×  270 = 150

You are Correct!