If those are feet, and you are talking about a rectangular box, then just multiply the numbers. If the numbers are any other unit (and you are still talking about a rectangular box), then convert each of the numbers to feet first.
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A meaningless question. 20 cubic feet is a volume, not an area.
1*4*5 = 20 cubic feet.1*4*5 = 20 cubic feet.1*4*5 = 20 cubic feet.1*4*5 = 20 cubic feet.
There are: 20*4*7 = 560 cubic feet
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.
20 x 24 x 1 = 480 cubic feet