Table: school_board
Columns: name
location
enrollment
1_year_ranking_of_727
5_year_ranking_of_693

Question: How many enrollments have a location of Guelph and a 1-year ranking of 727 larger than 717?
SQL: SELECT COUNT("enrollment") FROM school_board WHERE "location" = 'guelph' AND "1_year_ranking_of_727" > 717