Question 415883
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Hi
Let x and (2x-3) represent the width and length respectively
Question states***
  2(2x-3) + 2x = 54units
Solving for x
   6x = 60    
x =10, the width.  The length is 17   (20 -3)
CHECKING our Answer***
 2*17 + 2*10 = 34 + 20 = 54units 
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">