Answer
It takes 36 seconds to download 16 songs
Work Step by Step
It takes 2$\frac{1}{4}$ seconds to download 1 song, which is equal to $\frac{9}{4}$ seconds. To download 16 songs, we multiply the time needed for 1 song by 16.
So, $\frac{9}{4}$ $\times$ 16 = $\frac{9 \times 16}{4}$
Factor the numerator and the denominator:
$\frac{9\ \times\ 4\ \times 4}{4}$ =
Cancel the common factors in the numerator and the denominator to obtain:
9 $\times$ 4 = 36 seconds
