Answer :
The ratio of girls to students at a middle school is 10 to 18
[tex]\frac{\text{girls}}{\text{students}}=\frac{10}{18}[/tex]If there are 270 students at the school, how many are girls?
Let x be the number of girls.
Then we can set up the following proportion
[tex]\frac{10}{18}=\frac{x}{270}[/tex]Let us solve for x
[tex]\begin{gathered} \frac{10}{18}=\frac{x}{270} \\ x=\frac{10}{18}\cdot270 \\ x=150 \end{gathered}[/tex]Therefore, there are 150 girls.