Question

the flooring of the house of mr. perez has an area of 640 square feet and it is a foot below road level. he wants it raised a foot above road level to avoid flood. how much filling materials is needed?

Answer 1

1280 cubic feet of material. 640 ft^2 * 1 ft = 640 ft^3, from -1 ft to 0 is 640 ft^3 + 640 ft^3 for 0 to 1 ft above road level = 1280 ft^3 of material