Question 878666
You can generalize further and say, the length is <i>k</i> more than <i>m</i> times its width; find perimeter.


{{{L=mw+k}}} and if p is perimeter, either known or unknown,{{{p=2w+2L}}}.
Substituting for L gives....
{{{p=2w+2(mw+k)}}}
{{{highlight(p=2w+2mw+2k)}}}.


Your given description used k=4 and m=2.