You can't express a volume of concrete in yards.
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123.44 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
If your pour to a standard 4-inch depth, you will need 3.54 Cubic Yards.
55.56 cubic yards.
If you multiply that out, you'll get cubic units. It doesn't make sense to convert that to yards.