CREATE TABLE table_27133147_3 (date_of_vacancy VARCHAR(255), manner_of_departure VARCHAR(255), position_in_table VARCHAR(255))
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"