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_75 (silver INTEGER, gold INTEGER)
### Question:
What is the average of the silver that has less than 0 gold
### Answer:
SELECT AVG(silver) FROM table_name_75 WHERE gold < 0