wall paper,312 cm long and 25 cm wide is required to cover the walls of a room. length of the room is 7 m and its breadth is twice height.determine the height of the room.
We assume, that room doesn't have any windows and doors. For paper S=312*25 For walls S=2*(l+b)*h l=700 sm b=2h 2*(700+2h)h=312*25 4h^2+700h-7800=0 h^2+125h-1800=0 Hence, h=13 sm So, we see, that input data are not right. If we will take wall paper 3120 sm length, we get h=185 sm, that is normal result.