Hi



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' 

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