Question 381644
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Hi,         
Let x and (2x-6) represent the width and length respectively
 P = 2*l + 2*w   ***
 60m = 2(2x-6) + 2x
Solving for x
 60m = 4x - 12m + 2x
 72m = 6x
  x = 12m, the width.  The length is 18m.   (2*12 - 6)
CHECKING our Answer***
2*12m + 2*18m = 24m + 36m = 60m