 
Arturo O. answered  11/18/19
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W = width
L = length = 2W + 6
Perimeter:
2(L + W) = 2[(2W + 6) + W] = 60
6W + 12 = 60
W = (60 - 12)/6 in = 8 in
Test the answer.
 
     
             
                     
                    