Volume = 11.85 Cubic Yards.
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About 24 cubic yards of cement is required for a slab that size.
3.56 Cubic Yards
For a 16' x 24' slab with a depth of 4", you would need a minimum of 4.74 cubic yards.
Assuming a thickness of four inches and allowing about 5% waste, you would need 9.33 cubic yards or about 419 80lb bags.
You will need 3.1 cubic yards or 139 80lb bags. This assumes a waste of about 5% which is typical.