Table schema:
CREATE TABLE table_name_74 (episode INTEGER, date VARCHAR, performer_1 VARCHAR, performer_3 VARCHAR)

Question: Performer 1 of greg proops, and a Performer 3 of ryan stiles, and a Date of 25 august 1995 is which average episode?
SQL: SELECT AVG(episode) FROM table_name_74 WHERE performer_1 = "greg proops" AND performer_3 = "ryan stiles" AND date = "25 august 1995"