## Precalculus (6th Edition) Blitzer

$\dfrac{18}{38}$
We see that there are a total of $100$ students in this survey and $38$ students with blue eyes, which can be our denominator. Also, there are $10$ male students with green eyes and $50$ females students. This implies that out of $38$ students, $18$ are male; this will be our numerator. That is, $\dfrac{18}{38}$