Answer
$12$
Work Step by Step
$\frac{15}{4}$. $\frac{16}{5}$
Multiply numerators and multiply denominators.
$\frac{15}{4}$ . $\frac{16}{5}$= $\frac{15*16}{4*5}$ = $\frac{240}{20}$
Convert it into lowest term by dividing numerator from denominator = $12$