Question 374805
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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