That depends on the shape of the tank and the area of its bottom.
The question neglects to describe either characteristic.
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convert inches to gallons in a 400 gallon tank
Gallons in a rectangular tank =(tank's length in inches) times (tank's width in inches) times (water depth in inches) divided by (231)
The tank has a volume of 48 inches x 18 inches x 15 inches or 12960 in3. The average imperial gallon has a volume of 231 cubic inches. 12960 in3 ÷ 231 in3/US gallon = 56.10 gallons.
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".
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