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_49 (year INTEGER, quantity VARCHAR, gwr_numbers VARCHAR)
### Question:
What is the average Year that has a Quantity of 10, and a GWR Numbers of 409, 290, 315, 317–321, 324, 333?
### Answer:
SELECT AVG(year) FROM table_name_49 WHERE quantity = 10 AND gwr_numbers = "409, 290, 315, 317–321, 324, 333"