Question

You are designing an aquarium that is to have a tank holding 225,000 gallons of water. The tank will be 100 feet long and 20 feet wide. How high will the tank need to be?

Answer 1

So hmmm notice the picture below

thus   $\bf \textit{volume of a rectangular prism}\\\\ V=lwh\qquad \begin{cases} l=length\\ w=width\\ h=height\\ ----------\\ l=100\\ w=20\\ V=225,000 \end{cases}\implies 225,000=(100)(20)h$

solve for "h"