It takes $8$ cups of chocolate chips to make $12$ cookies. How many cups of chocolate chips will it take to make $15$ cookies?
The proportion of cups of chocolate chips to cookies is constant and can be simplified as $\frac{8}{12} = \frac{2}{3}$. Thus, if $x$ is the number of cups of chocolate chips it will take to make $15$ cookies, $\frac{2}{3} = \frac{x}{15}$. Solving for $x$ gives an answer of $\boxed{10}$ cups.

By the way, $\frac{2}{3}$ cup of chips for a cookie? Wowzers.