Table schema:
CREATE TABLE table_name_57 (average VARCHAR, matches VARCHAR, best_bowling VARCHAR, team VARCHAR, wickets VARCHAR)

Question: What is the total average for the England team when the wickets are less than 18, the best bowling is 4/138, and there are less than 3 matches?
SQL: SELECT COUNT(average) FROM table_name_57 WHERE team = "england" AND wickets < 18 AND best_bowling = "4/138" AND matches < 3