Question 384431
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Hi,         
Let x and (x+3)represent the width and length respectively
P = 30in
30in = x + x + (x+3) + (x+3)
solving for x
30in = 4x + 6
24in  = 4x
  x = 6in, the width.  Length is 9in.     (6in + 3in)

CHECKING our Answer
 2*6in  + 2*9in  = 12in + 18in = 30in