None. A cubic foot is a three dimensional measure - of volume. The question gives only a two dimensional plane area. There is insufficinet information to give a sensible answer.
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To calculate the volume in cubic feet, you would multiply the length, width, and height together. Given a 20' by 18' area, you would need a height measurement to calculate the cubic feet.
There are approximately 4.24 cubic feet in a 20 gallon propane tank.
To convert cubic feet to cubic meters, multiply the number of cubic feet by 0.0283168. So, to convert 20 cubic feet to cubic meters: 20 ft^3 * 0.0283168 = 0.566336 cubic meters.
The front yard's volume would be 240 cubic feet. This is calculated by multiplying the length (12 feet) by the width (20 feet) by the depth (1 foot).
The total volume of the refrigerator is 45 cubic feet (3 x 2.5 x 6). Subtracting the 20 cubic feet taken up by the walls and other parts, there are 25 cubic feet left for storage in the refrigerator.
Dirt has varying densities, but on average, 18 tons of dirt would fill about 12 cubic yards.