10 square feet x 20 square feet equals how many yards?

Answer 1

It is impossible to give a sensible answer to this question. 10 square feet x 20 square feet is a measure in 4-dimensional space, where all four dimensions are of length. A yard is a measure in a 1-dimensional linear space. Apart from the fact that 4-d linear space does not exist, basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.