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_3 (grid INTEGER, constructor VARCHAR, laps VARCHAR)
### Question:
What was the average grid at the time Vanwall was constructor and there were 17 laps?
### Answer:
SELECT AVG(grid) FROM table_name_3 WHERE constructor = "vanwall" AND laps = 17