Question 1071787
{{{system(wL=144,(L+5)w=wL+40)}}}


{{{wL+5w=wL+40}}}

{{{5w=40}}}

{{{w=8}}}


-

{{{L=144/w}}}

{{{L=144/8}}}

{{{L=18}}}



New length, {{{L+5=18+5=highlight(23)}}}