5,775 cubic inches in 25 US gallons.
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1 gallon = 231 cubic inches Volume of the tank is (10 x 20 x 12) = 2,400 cubic inches The tank has a capacity of (2,400 / 231) = 10.39 gallons (rounded), but we have no way of knowing how many gallons are "in it".
If that is in inches, multiply it out, the result will be in cubic inches. To convert that to gallons, you then divide by 231, since a gallon is defined as 231 cubic inches.
1 gallon = 231 cubic inches. Multiply L X W X H (in inches) to get cubic inches, then divide by 231 to get gallons. 179.53 gallons
72"X18"x8"=10368 cubic inches 10368 cu in x 0.00433 cubic inches/gal = 44.9 gallons Answer: 44.9 gallons
A U.S. gallon is exactly 231 cubic inches. 60 x 18.75 x 19 = 21,375.0 cubic inches = 92.532 U.S. gallons