user: Question: What is the average number of silver medals of the nation with 3 bronzes and more than 4 total medals?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Soviet Union', 9.0, 5.0, 2.0, 16.0]
SQL:

assistant: SELECT AVG("Silver") FROM "Table" WHERE "Bronze" = 3.0 AND "Total" > 4.0;