Question 435755
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Hi
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">
table is 3 times as long as it is wide
Let x and 3x represent the width and length respectively
  2*3x + 2x = 20ft
      8x = 20ft
       x = 20/8 = 2.5ft wide and the length is 7.5ft

CHECKING our Answer*** 
   2*7.5' + 2*2.5' = 15' + 5' = 20'