user: Question: What is the average Total for the Rank of 6, when Silver is smaller than 0?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Soviet Union (URS)', 3.0, 3.0, 2.0, 8.0]
SQL:

assistant: SELECT AVG("Total") FROM "Table" WHERE "Rank" = 6.0 AND "Silver" < 0.0;