In typing the question, all three dimensions have been labeled with the symbol
for feet ( ' ) which makes for an enormous box.
74-ft x 63-ft x 20-ft = 93,240 cubic feet = 161,118,720cubic inches = 3,4531/3 cubic yards.
If the dimensions were intended to be in inches, then the solution is
74-in x 63-in x 20-in = 93,240 cubic inches = 53.958 cubic feet = 403.64 gallons
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231 cubic inches = 1 US gallon.Volume of the tank = 20" x 20" x 40" = 16,000 cubic inches = 69.264 gallons (rounded)
Multiply 20 x 15 x 78 = 23400 cubic cm = 1428 cubic inches
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".
Volume = 11,451 cubic inches or 6.26 cubic feet.
Well, let's get down right now to some math, shall we? Volume = 20 ft x 50 ft x 4 in = 240 in x 600 in x 4 in = 576000 in cubed. 1 cubic yard = 3 x 3 x 3 cubic feet (27 cubic feet) 1 cubic feet = 12 x 12 x 12 cubic inches (1728) 576000 cubic inches / 1728 cubic inches (in a yard) = 333.33 cubic yards.