A fish tank in the shape of a right rectangular prism has a volume of 1,920 cubic inches. What is the width of the tank if the height is 12 inches and the length is 20 inches.
The volume of a right rectangular prism is given by the formula $V=lwh$, where $l$ is the length, $w$ is the width, and $h$ is the height. We are given that $V=1920$, $h=12$, and $l=20$. Plugging these values into the formula, we have $1920=20\cdot w\cdot 12$. Dividing both sides by $240$, we get $8=w\cdot 1\cdot 12$. Dividing both sides by $12$, we find that the width, $w$, is $\boxed{8}$ inches.
