[tex]\begin{gathered} \text{ If 45 girls represent the 30\% of the athletic program, then the 100\%, or the total population of girls is} \\ \\ n=\frac{100}{30}\cdot45 \\ \\ n=\frac{10\cdot45}{3} \\ n=\frac{450}{3} \\ n=150 \end{gathered}[/tex]
There are 150 students in the girls athletics program