user: ### NOW ANSWER:
Question: I want the average bronze for total of 19 and silver of 8 with rank of 31
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'China (CHN)', 63.0, 46.0, 32.0, 141.0]
SQL:

assistant: SELECT AVG("Bronze") FROM "Table" WHERE "Total" = 19.0 AND "Silver" = 8.0 AND "Rank" = '31';