Table schema:
CREATE TABLE table_name_20 (total INTEGER, club VARCHAR, fa_cup_goals VARCHAR, league_goals VARCHAR)

Question: What is the average Total, when FA Cup Goals is 1, when League Goals is 10, and when Club is Crystal Palace?
SQL: SELECT AVG(total) FROM table_name_20 WHERE fa_cup_goals = "1" AND league_goals = "10" AND club = "crystal palace"