CREATE TABLE table_name_3 (grid INT, constructor VARCHAR, laps VARCHAR)

What was the average grid at the time Vanwall was constructor and there were 17 laps?
SELECT AVG(grid) FROM table_name_3 WHERE constructor = "vanwall" AND laps = 17
SELECT AVG("grid") FROM "table_name_3" WHERE "constructor" = "vanwall" AND "laps" = 17