Question 137501
Nope, that won't get you there.

Given: Perimeter = 144M and length is 9 m more than twice the width.

{{{P = 2L + 2W}}} = 144
{{{L = 2W + 9 }}}

{{{144 = 2L + 2W}}}
{{{144 = 2(2W+9) + 2W }}}
{{{144 = 4W + 18 + 2W}}}
{{{126 = 6W}}}
W = 21
So L = 51

Check you answer. Does 144 = 2*51 + 2*21???