Question

Dean needs

Answer 1

P = 2(W + L)
P = 60
L = 2W

These are the correct ones:
60 = 2(W + 2W) or W + 2W + W + 2W = 60  or 2*W + 2*2W = 60

so the one that does not work is the last one : W + 2w = 60 <==