Question 480646
Call the width of the field w  (for width)
The length is twice the width, so the length is 2w

The area of the field is the length times the width = 2w X w = {{{2w^2}}}

So {{{2w^2}}} = 28900

Divide both sides by 2

{{{w^2}}} = 14450

Take the square root of both sides :

The width is 120.21 and the length is 240.42