Question 797693
L length, W width.
L=-15+2W


{{{2L+2W=2(2W+15)+2W=102}}}
{{{4W+30+2W=102}}}
{{{6W+30=102}}}
{{{6W=102-30}}}
{{{6W=72}}}
{{{W=6}}}
.
and L....?