Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### 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