user: Question: what is the average total when bronze is more than 0, gold is 0, the nation is united states (usa) and silver is 0?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Belgium (BEL)', 7.0, 10.0, 3.0, 20.0]
SQL:

assistant: SELECT AVG("Total") FROM "Table" WHERE "Bronze" > 0.0 AND "Gold" = 0.0 AND "Nation" = 'united states (usa)' AND "Silver" < 0.0;