Question

The area of a rectangular wall of a barn is 140 square feet. Its length is 6 feet longer than twice its width. Find the length and width of the wall of the barn.

Answer 1

$l*w=140$
$l=2w+6)$
$(2w+6)*w=2w ^{2} +6w=140$
$70=w^2+3w$
$70=w(w+3)$
w=7
$l=2(7)+6$
$l=20$