The width is 10 ft and the length is 20 ft
Explanation:
w = width
l = 2w
A = l*w
200 = lw
= (2w) *w
200 = 2w^2
Divide each side by 2
200/2 = 2w^2 /2
100 = w^2
Take the square root of each side
sqrt(100) = sqrt( w^2)
10 = w
l =2w = 2(10) = 20
The width is 10 ft and the length is 20 ft