A yard of concrete is 27 cubic ft. Your measurements, if in feet,
represents 480 cubic ft. Dividing this by 27 results in 17.78 yards.
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8.25 cubic yards of concrete
For a 4-inch thick slab, you will need at least 9.48 Cubic Yards.
Assuming you pour to a depth of 4 inches, you will need 30.86 cubic yards.
30' x 20' (600 square feet) = 66.6 square yards.
100 acres = 100*4840 = 48400 sq yards 100 acres*50 feet = 48400*50/3 cubic yards = 8,066,666.66... cu yards.