Question 939757

The length a rectangle is twice that of its width. If the area of the rectangle is 72 square inches, then find the length and width. 
How do I do this please include details and each step thank you
Someone else answered the question with the answer as w=6 
L=12. But I don't understand how they got it if someone can give me the steps or explain it to me please.
<pre>
Let width be W
Then length = 2W
Area = LW, and since area = 72 sq in, we get:
2W(W) = 72
{{{2W^2 = 72}}}
{{{W^2 = 72/2}}}
{{{W^2 = 36}}}
W, or width = {{{sqrt(36)}}}, or {{{highlight_green(6)}}} inches
Length: 2(6), or {{{highlight_green(12)}}} inches