Question 608006
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Hi
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">
length that is twice as long as its width
Let x and 2x represent the width and length respectively
 2x + 2(2x) = 36
      6x = 36
       x = 6, the width, the length is 12 
CHECKING our Answer***
   12 + 24 = 36