Table: rangers_season_10
Columns: game
january
opponent
score
record

Question: Who was the opponent with the record of 15-21-6?
SQL: SELECT "opponent" FROM rangers_season_10 WHERE "record" = '15-21-6'

Question: What day in January was the game greater than 49 and had @ Montreal Canadiens as opponents?
SQL: SELECT SUM("january") FROM rangers_season_10 WHERE "opponent" = '@ montreal canadiens' AND "game" > 49

Question: What was the total number of games on January 20?
SQL: SELECT COUNT("game") FROM rangers_season_10 WHERE "january" = 20