Karen is buying a wallpaper border for her bedroom, that is 12 ft by 13 ft If the border is sold in rolls of 5 yards each, how many rolls will she required to purchase?

The distance around the room is 2(12) + 2(13) or 50 ft. Every roll of border is 5(3) or 15 ft. By dividing the total distance, 50 ft, through the length of each roll, 15 ft, we ?nd out we required 3.33 rolls. Since a roll cannot be subdivided, 4 rolls will be required.