There can be no conversion.
A linear foot is a measure of length in 1-dimensional space while 20' x 5' is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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Two linear yards equals six linear feet and twqo cubic yards equals 54 cubic feet.
45
The units cannot be converted
855 square feet.
20 linear feet would be "length", 3 feet would be width. To get square feet, multiply length by width.