Answer
$20$
Work Step by Step
To solve the given equation for $h$, we multiply both sides by $3$ and then divide both sides by $\pi r^2$ as follows
$$
V=\frac{\pi r^2h}{3}\Longrightarrow 3V= \pi r^2h \Longrightarrow h=\frac{3V}{\pi r^2}
.$$
Now, by substitution, we have
$$
h=\frac{3V}{\pi r^2}=\frac{3\times753.6}{\pi 6^2}=19.99\approx 20
.$$
