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It depends on the type of concrete (or shall we say cement). If you grabbed a bag of ready-mix all you will need to do is add water, you will get concrete (although based on the purpose of the mix you may need to add larger aggregate (stone)).
If you grabbed a bag of cement, it is up to your mix design (water:cement:coarse aggregate:fine aggregate:air) at how much you will get. If you are interested in a standard mix design I am sure I can dig something up for you if you are in need.
Slacker00
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