Question 549593
Let's let L represent the length and W represent the width:

We know that {{{L=2W}}}(Equation (1)) from the problem.
We also know that {{{Area=L*W}}}
Substituting our equation (1) and given area information into this we get:
{{{2W*W<50}}}
{{{2W^2<50}}}


You can solve for W in this, I will leave that up to you, if you have any questions about it please let me know:)
Have a good one!