How many 2-inch by 3-inch by 8-inch bricks will you need to build a (uniformly wide) brick walk with the shape shown in the figure below? (Lay the bricks so that the largest face is up. Assume that a

How many 2-inch by 3-inch by 8-inch bricks will you need to build a (uniformly wide) brick walk with the shape shown in the figure below? (Lay the bricks so that the largest face is up. Assume that a = 10 ft, b = 8 ft, and c = 20 ft. )