CREATE TABLE table_name_29 (league_cup_goals VARCHAR(255), club VARCHAR(255), total VARCHAR(255), fa_cup_goals VARCHAR(255))
How many League Cup goals correspond to 3 FA Cup Goals and a total over 15 for Chesterfield?
    
SQL: SELECT league_cup_goals FROM table_name_29 WHERE total > 15 AND fa_cup_goals = 3 AND club = "chesterfield"