Question 896772
P = 80 (given)
L = 3W (given)
P = 2L + 2W
80 = 2L + 2W
80 = 2(3W) + 2W
80 = 6W + 2W
80 = 8W
10 = W
If the width is 10, then the length is 3x that, or 30.