A. W = 5 feet
We know the area = length x width.
We know length = w + 5.
5 + 5 = 10, multiplied by 5 = 50
It’s not B, because 6 + 5 = 11, and 11 x 6 = 66
It’s not C, because 12 + 5 = 17, and 17 x 12 = 204
It’s not D, because 4 + 5 = 9, and 9 x 4 = 36