Hi, 

   length is 6 yards shorter than twice it's width      

Let x and (2x-6) represent the width and length respectively

Question states*** P = 504

504 = x + x + (2x-6) +(2x-6)

solving for x

504 = 6x - 12

516 = 6x

86 = x, the width, Length is 166   (2*86 - 6)



CHECKING our Answer

 2*86 + 2*166 =  172 + 332 = 504 

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