Question

A large cylindrical cooler is 2 (1 )/2 feet high and has a diameter of 1 1/2 feet. It is filled

Answer 1

$\bf \textit{volume of a cylinder}\\\\ V=\pi r^2 h\qquad \begin{cases} r=radius=\frac{diameter}{2}\\ h=height\\ ----------\\ diameter=1\frac{1}{2}\\\\ r=\cfrac{1\frac{1}{2}}{2}\\\\ h=2\frac{1}{2} \end{cases}$

so.. get the full volume of the cooler, by plugging in the given values

now, the cooler is only filled 3/4, how much is 3/4 of that? well, let's say you got a value V, 3/4 of that is , well $\bf \cfrac{3}{4}\cdot V$