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.
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.
You will need 0.56 cubic yards of concrete.
40.1 cubic yards
It depends on how deep the concrete. 600 sq ft at 6 inch deep is 300 cu ft = 11.1 yards. 12 inch deep is 22,2 yards; 4 inch deep is 5.5 yards
3880 cubic yards
1.19 Cubic Yards
about 5 yards if your slab is 4" deep
123.44 cubic yards
How deep? 1 inch will take .7 yards
You'll need 1.23 Cubic Yards.
2.2 Yards
You will need 1.36 cubic yards of cement.
If the slab is the standard 4" deep, you will need at least 8.89 cubic yards.