Question 1006231
{{{system(L=w+12,2w+2L=60)}}} L for length, w for width.


{{{w+L=30}}}
{{{w+(w+12)=30}}}
{{{2w+12=30}}}
{{{2w=18}}}
{{{highlight(w=9)}}}, and from this {{{highlight(L=21)}}}.