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The width is 4ft the length is 16ft
Yes. I guess it depends on which sidewalk you're talking about.
(20+2w)x(12+2w)-(12x20)=68 w=1
The width would be X, and the length 4 X. Since the perimeter of 40 ft is the two lengths, and the 2 ends, that would be X+X+4X+4X= 40 ft, or 10X= 40 ft, simplified by dividing both sides of the = by 10, to get X=4 and 4X=16.
I believe that the average width of a pencil is 0.25 inchs or 0.6 centimeters.