1 cubic yard = (3 ft x 3 ft x 3 ft) = 27 cubic ft The given slab is: (256 ft2) x (1/2 ft) = 128 ft3 128 ft3 = (128 / 27) = 4.741 yd3 They'll charge you for 5 [cubic] yards, or the truck minimum, whichever is larger.
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200 cubic feet or 7.4 cubic yards
3 inches = .25 feet400 square feet X .25 feet = 100 cubic feet100 cubic feet / 27 cubic feet per cubic yard = 3.7 yards
One cubic yard covers 81 square feet 4 inches thick.
6 inches = 0.5 feet 256 square feet * 0.5 = 128 cubic feet There are 27 cubit feet in a cubic yard (3 feet x 3 feet x 3 feet), so 128 cubic feet = 4.741 cubic yards.
27 cubic feet = 1 cubic yard4 inches = 1/3 foot(81 square feet) x (1/3 foot) = 27 cubic feet = 1 cubic yard