3.5 to 4 yards, depending to some extent on where you live and building codes. 6" uniform thickness would require around 3.5 yards.
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25 Yards of concrete
37.03 yards
A 40x60x6in slab requires 44.44 cubic yards of cement.
about 5 yards if your slab is 4" deep
A 40'x40'x6" slab requires 29.63 cubic yards of cement.