Question 777977
Let L = the length, W = the width of the pool
The walkway can be divided into 4 rectangles.  On the long sides, the dimension of the rectangles are 2 x L+4, and on the short sides the dimensions are 2 x W.
Since there are two each on the long and short sides, the total area A = 100 = 4(L+4) + 4W
And L = 2W so we have 4(2W+4) + 4W = 12W + 16 = 100 -> W = 7
So the width is 7 ft, the length is 14 ft.