Question 389441
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Hi, 
Let x and (x-12)represent the length and width respectively        
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">
Question states***
 2x + 2(x-12) = 108
solving for x
 4x - 24 = 108
    4x = 132
     x = 33 units, the length

CHECKING our Answer***
  66 + 2*21 = 66 + 42 = 108