What's the average number of silver medals when bronze is less than 0?
CREATE TABLE table_name_86 (silver INTEGER, bronze INTEGER)
SELECT AVG(silver) FROM table_name_86 WHERE bronze < 0
### Context: CREATE TABLE table_name_86 (silver INTEGER, bronze INTEGER) ### Question: What's the average number of silver medals when bronze is less than 0? ### Answer: SELECT AVG(silver) FROM table_name_86 WHERE bronze < 0