A garden plot: its length is to be twice its width

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A garden plot: its length is to be twice its width

I have an assignment. Mensuration of plane figures.
1. A garden plot is to contain 200 sq. Ft. If its length is to be twice its width, what should be dimension?

Eq.

Eq.
1. Length(L) = Twice of Width (2W)
2. Area(A) = Length(L) x Width(W)

A=L x W, and L=2W
A=2W x W
A=2(W^2) , A = 200
200 = 2 (W^2)

W = 10

L = 2(W)
L = 2X10
L = 20

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