Question

Three fifths of the cast in a musical have to sing.What fraction on the cast does not have to sing?

Answer 1

The term "three fifths" is equivalent to $\frac{3}{5}$.
If $\frac{3}{5}$ of the cast is singing, then we just have to find the rest of the fraction.
$1- \frac{3}{5} \\ \frac{5}{5}- \frac{3}{5} \\ \frac{2}{5}$

Answer 2

Well, 3/5 of the cast is singing and the whole group would be 5/5 so then that makes 5/5 minus 3/5 which equals 2/5 don't have to sing!