Question 478696
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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 4cm more than the width
Let x and (x+4cm) represent the width and length respectively
Question states***
P= 2(x+ 4cm) + 2x = 3(x+4cm) + 4cm
         x = 8cm, the width
         
CHECKING our Answer*** length is 12cm  (8cm+4cm)
  2*12cm + 2*8cm = 40cm = 3*12cm + 4cm = 40cm