1 gallon is equal to 231 cubic inches.
To calculate the volume of the tank in cubic inches, we multiply the length, width, and height:
Volume = 24 x 10 x 13.5 = 3,240 cubic inches
Then, we divide the volume in cubic inches by 231 to find the volume in gallons:
Volume = 3,240 / 231 = 14 gallons
Therefore, a 24 inch by 10 13.5 tank holds 14 gallons of water.