Question

At summer camp the ratio of boys to girls was 10 : 1. If there were 30 boys, how manygirls were there?

Answer 1

The ratio of boys to girls was 10.

Boys:Girls = 10:1

If there were 30 boys then let x be the number of girls.

$\frac{\text{Boys}}{\text{Girls}}=\frac{10}{1}=\frac{30}{x}$

Let us solve for x.

$\begin{gathered} \frac{10}{1}=\frac{30}{x} \\ 10\cdot x=30\cdot1 \\ 10x=30 \\ x=\frac{30}{10} \\ x=3 \end{gathered}$

So, there were 3 girls.