user: Question: Can you tell me the total number of Roll that has the Area of aranga?
Columns: ['Name', 'Years', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Aranga School', '1–8', 'Aranga', 'State', 4.0, 39.0]
SQL:

assistant: SELECT SUM("Roll") FROM "Table" WHERE "Area" = 'aranga';