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Hi,

length of a rectangle is 1 foot more than twice the width
Let x and (2x+1)represent the width and length respectively
P = 2x + 2(2x+1) = 20ft
6x = 18ft
x = 3ft, the width. the length is 7ft (2*3+1)
CHECKING our Answer***
2*3ft + 2*7ft = 20ft