The page below (under "Scalability & Performance") gives 50 for Enterprise and 16 for Standard edition:

http://www.microsoft.com/sqlserver/2008/en/us/editions-compare.aspx

I had seen the comparison above and got the question right. However, unless I'm missing something, this does seem to contradict the page referenced by the answer's explanation (from the BOL) at

http://msdn.microsoft.com/en-us/library/ms143432.aspx