Question 840582
P = perimeter = 108; P is found by the equation P = 2w + 2l, where w is width and l is length

since w = l - 24

then P = 2w + 2l can be written as P = 2(l-24) + 2l

thus 108 = 2l - 48 + 2l

108 + 48 = 4l

156/4 = l = length = 39

i'll leave you to work out the width