Question 611465
We know that perimeter is {{{2l+2w=p}}}, so let's plug what we have into this equation. {{{2(6+w)+2w=40}}}.
Now, we just simplify: {{{simplify_cartoon ( 2(6+w)+2w=40 )}}}.
We end up with {{{4w=28}}}. Divide the four: {{{w=7}}}
Now we know that the width is 7, and we plug that into the original formula. {{{2(6+7)+2(7)=40}}} to {{{2(13)+2(7)=40}}}
So, the width is 7 and the length is 13!