Question 418646
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Hi
The length of a rectangle is five times its width
Let x and 5x represent the width and length respectvely
  2*5x + 2*x = 72ft
     12x = 72ft
       x = 6ft, the width.  the length is 30ft  (5*6ft)
CHECKING our Answer***
2*30ft + 2*6ft = 72ft
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">