Perry, Dana, Charlie, and Phil played golf together every week.  At the end of the season, Perry had won five more games than Dana, but Charlie had won 2 games fewer than Dana.  Phil had won 3 games more than Charlie did.  If Phil won a total of 12 games, how many more games did Perry win than did Phil?
If Phil had won 3 games more than did Charlie, and Phil won 12 games, then Charlie won 12-3=<T>subtract(12, 3)=9 games.
If Charlie had won 2 games fewer than Dana, and Charlie won 9 games, then Dana won 9+2=<T>add(9, 2)=11 games.
If Perry had won five more games than did Dana, and Dana won 11 games, then Perry won 11+5=<T>add(11, 5)=16 games.
Thus, Perry won 16-12=<T>subtract(16, 12)=4 more games than did Phil.
