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_50 (silver INTEGER, gold INTEGER)
### Question:
What is the Average for Silver medals that have more than 17 Golds?
### Answer:
SELECT AVG(silver) FROM table_name_50 WHERE gold > 17