Respuesta :

Let width be x, 
Length: 3+x 

P=2(l+w) 
54=2(x+(x+3)) 
54/2=2x+3 
27=2x+3 
27-3=2x 
24=2x
24/2=x 
12=x 

Therefore, the width is 12 inches and the length is (12+3)=15 inches

Hope I helped :)