A rectangular athletic field is twice as long as it is wide

A rectangular athletic field is twice as long as it is wide. If the perimeter of the athletic field is 216 yards, what are its dimensions?

Solution

rectangular field 2 width = Length

also 2(length +width) = 216

or 2(3width) = 216

or 6 width= 216

or width is 36

then length is 72