CREATE TABLE table_name_15 (grid INT, time_retired VARCHAR, laps VARCHAR)

what is the grid when the time/retired is oil pressure and the laps are more than 50?
SELECT AVG(grid) FROM table_name_15 WHERE time_retired = "oil pressure" AND laps > 50
SELECT AVG("grid") FROM "table_name_15" WHERE "laps" > 50 AND "oil pressure" = "time_retired"