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_13 (gold INTEGER, rank VARCHAR, silver VARCHAR)
### Question:
What is the average number of golds for teams in rank 17 with more than 4 silver?
### Answer:
SELECT AVG(gold) FROM table_name_13 WHERE rank = "17" AND silver > 4