Question 426103
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Hi
The length of a rectangle is 8 cm more than two times the width
Let x and (2x+8cm) represent the widthe and length respectively
Question states***
 2(2x+8) + 2x = 40cm
Solving for x
    6x = 24
     x = 4cm. the width, the length is 16cm.  (2*4cm + 8cm)

CHECKING our Answer***
  2*16cm + 2*4cm = 40cm
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">