Coach Smith wants to paint his classroom walls red. Each wall is 25 feet long and 9 feet tall. The janitor says he can only order the paint in boxes that contain 3 small cans. One box is used to paint a 125 square foot on the wall. How many boxes does he need to order? How many paint cans will he have ordered in total? How many cans will be used to paint all the walls in the room? How many paint cans will not be opened?