Hi, The data you provided is contradicting. If L = length, W = width and P = perimeter. Than P = 2 (L + W). Now if P = 120 and L = W + 100 than 120 = 2(W + 100 + W) 120 = 4W + 200 W = -25 miles IMPOSSIBLE........ So the perimeter can't be 120...... If L = 380 and W = 280 then: P ...