Carol H. answered 02/20/19
Experienced Mathematics Tutor w/ Master's Degree in Math
Let w = the width
Let 2w - 3 = the length
P = 2l + 2w
54 = 2(2w - 3) + 2w
54 = 4w - 6 + 2w
54 = 6w - 6
60 = 6w
10 feet = w
length = 2w - 3 = 2(10) - 3 = 20 - 3 = 17 feet