## Elementary Technical Mathematics

Let the width of the rectangle be $x$ and its length be $6+2x$. Now, since the perimeter of the rectangle is 48 in, then we have $perimiter=2*length+2*width=48$ $$2x+2(6+2x)=48\Longrightarrow 6x=36\Longrightarrow x=6.$$ So, the width is 6 in and the length is 18 in.