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Infinitely many. Select any number, W, such that 0 < W ≤ 15. Since numbers are infinitely dense, there are infinitely many possible values for W. Let L = 30 - W. Then W ≤ L so each choice of W leads to a unique pair (W, L). Now, a rectangle with width W cm and length L cm has a perimeter of 2*(L+W) = 2*(30 - W + W) = 2*30 = 60 cm, as required.
As Y and W are not numbers, you can not divide one by the other.
8
yes it does
An ohm per square depends on the effective area of a sheet. Let us look at a sheet that is W um by L um. A square is a calculation which answers how many squares of size min(W,L) by min(W,L) are in an area. In other words how many squares are in an area defined by W and L is max(W or L) divided by min(W or L). The number of microns would require multiplication by at least 1 dimension.