Answer :

60 divided by 5, is 12. In which case, 12 times 3... Is 36$. So Leo would pay 36$ for 3 DVDs at the rate of 12$ for each DVD
[tex]\frac{\$60}{5}=\frac{x}{3}\ \ \ \ \ \ |cross\ multiply\\\\5x=3\times\$60\\\\5x=\$180\ \ \ \ \ \ |divide\ both\ sides\ by\ 5\\\\\boxed{x=\$36}\leftarrow answer[/tex]