CREATE TABLE table_name_20 (total INTEGER, club VARCHAR(255), fa_cup_goals VARCHAR(255), league_goals VARCHAR(255))
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"