Table schema:
CREATE TABLE table_name_82 (athlete VARCHAR, nationality VARCHAR, group VARCHAR, rank VARCHAR, result VARCHAR)

Question: Which athlete's rank is more than 15 when the result is less than 7.68, the group is b, and the nationality listed is Great Britain?
SQL: SELECT athlete FROM table_name_82 WHERE rank > 15 AND result < 7.68 AND group = "b" AND nationality = "great britain"