Question

The length of a rectangular pool is 4 times its width. if the perimeter of the pool is 140 meters, find its length and width of the pool

Answer 1

L=4W
P=2(L+W)
P=140

140=2(L+W)
divide both sides by 2
70=L+W
L=4W
70=4W+W
70=5W
divide both sides by 5
14=W
width=14 meters