Question 469980
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Hi,
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">
The length of a rectangle is 3 inches less than twice the width
Let x and (2x-3) represent the width and length respectively
  2(2x-3) + 2x = 18in
        6x = 24in
         x = 4in, the width.  The length is 5in  (2*4in-3in)

CHECKING our Answer***
  2*5in + 2*4in = 18in