How many 4 inches by 8 inches bricks are needed to build a wall 6 ft wide and 24 feet long?

There are 12 inches in one foot. Therefore the wall is 72 inches tall and 288 inches long. The area of that wall is 20, 736 inches squared. The area of one brick (4 inches X 8 inches) is 32 inches squared. The area of the wall divided by the area of one brick gives you the number of bricks need to make the wall (20736/36). The answer is 648. Therefore with a 4 by 8 inch brick you need 648 bricks to make a 6 by 24 feet wall.