Question 118469
First thing we know is that the length is given by {{{l=5w + 3}}} where w is the width.  The second thing we know is that the perimeter of a rectangle is given by {{{P=2l + 2w}}}.


Substituting:


{{{P=2(5w+3)+2w=126}}}


{{{10w+6+2w=126}}}
{{{12w=120}}}
{{{w=10}}}


And,
{{{l=5(10)+3=53}}}


So the dimensions are 53 meters by 10 meters