If the position in table is 10th, and the manner of departure was resigned, what was the date of vacancy?
create table table_27133147_3 (date_of_vacancy varchar, manner_of_departure varchar, position_in_table varchar, PRIMARY KEY (date_of_vacancy))
select date_of_vacancy from table_27133147_3 where manner_of_departure = "resigned" and position_in_table = "10th"