<span>You are not supposed to be wallpapering the ceiling or the floor. Because of that the formula to answering this question is: 2(h*w) + 2(l*w) [to account for the 4 walls being wallpapered] 2(9 x 18) + 2(9 x 20) 2(162) + 2(180) 324 + 360 684 is the answer </span>
