What week was the member who arrived on the main island in week 6 sent to the third island?
create table table_11764007_2 (week_sent_to_third_island varchar, week_arrived_on_main_island varchar, PRIMARY KEY (week_sent_to_third_island))
select week_sent_to_third_island from table_11764007_2 where week_arrived_on_main_island = "6"