Question 951350
Let {{{y}}} be the longer side.
{{{y=2x}}}
{{{P=2y+2x<=72}}}
{{{y+x<=36}}}
{{{2x+x<=36}}}
{{{3x<=36}}}
{{{x<=12}}}
On the lower end, {{{x>0}}} so,
{{{0<x<=12}}}