Custom report - number of candidates and the number of hires per source

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I am trying to build a report that gives the number of candidates and the number of hires per source (ultimately combining the info provided in the system reports titled Candidates Per Source and Hires Per Source into one report).  I can get the number of candidates OR the number of hires per source by filtering and using the aggregate function, but not both.  Here is what I did: Grouped all candidates by source.  Counted the number of candidates by source using the aggregation function in the # of Candidates colums. Now I can't get it to count just the