First, you have to find the volume of the aquarium. Since the aquarium is a rectangular prism, the formula for the volume is lwh.
L= 15, W=18, and H= 12.
15 x 18 = 270 270 x 12 = 3,240
Second, since there are 231 cubic inches in a gallon, we have to divide our 3,240 by 231.
3,240 divided by 231 = 14.025974.
Now, we just round it down to 14 gallons.
The aquarium can hold 14 gallons of water.
