Hi,

Let x represent the width, then the length  would be (x+4)

Perimeter is the Sum of all sides

x + x + (x+4) + (x+4) = 20in

solving for x

4x + 8 = 20in

4x = 12in 

x = 3in, the width.  Length is 7in   (3+4)

CHECKING our Answer

2*3in + 2*7in = 6in  + 14in = 20in 

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