user: Question: How many FTE teachers are there when the student:teacher ration is 19?
Columns: ['School Name', 'City', 'Students', 'FTE Teachers', 'Pupil/Teacher Ratio', 'School Level', 'Low Grade', 'High Grade']
Types: ['text', 'text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Bowers Elementary School', 'Santa Clara', 403.0, '21', '19.2', 'Primary', 'Kindergarten', '5th Grade']
SQL:

assistant: SELECT SUM("FTE Teachers") FROM "Table" WHERE "Pupil/Teacher Ratio" = '19';