A meaningless question. 20 cubic feet is a volume, not an area.
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48 by 23 by 20 whats? The answer will come out to cubic feet, not square feet. There are 1728 cubic inches in a cubic foot, so the answer is on the order of 12.78 cubic feet.
None, to work out cubic feet you need three dimensions, 3 feet x 20 feet is 60 square feet, to get to cubic feet you need another dimension.
1*4*5 = 20 cubic feet.1*4*5 = 20 cubic feet.1*4*5 = 20 cubic feet.1*4*5 = 20 cubic feet.
20 x 20 = 400 square feet.
There are: 20*4*7 = 560 cubic feet