## Precalculus (6th Edition) Blitzer

$\dfrac{30}{50}$ or, $\dfrac{3}{5}$
We see that there are a total of $50$ students and this will be our denominator. Also, there are $20$ female students and $10$ male student freshmen for a total of $30$ people. This implies that we $30$ people -- our numerator. That is, $\dfrac{30}{50}$ or, $\dfrac{3}{5}$