user: ### NOW ANSWER:
Question: How many Gold medals for the Nations with 6 or more Bronze medals and 18 or more Silver?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'Soviet Union', 7.0, 2.0, 6.0, 15.0]
SQL:

assistant: SELECT AVG("Gold") FROM "Table" WHERE "Bronze" > 6.0 AND "Silver" > 18.0;