Table schema:
CREATE TABLE table_27133147_3 (date_of_vacancy VARCHAR, manner_of_departure VARCHAR, position_in_table VARCHAR)

Question: If the position in table is 10th, and the manner of departure was resigned, what was the date of vacancy?
SQL: SELECT date_of_vacancy FROM table_27133147_3 WHERE manner_of_departure = "Resigned" AND position_in_table = "10th"