Table: t_1973_vfl_match_6
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What is the Home team score for Geelong, whereby the Away team has a score of 18.13 (121)?
SQL: SELECT "home_team_score" FROM t_1973_vfl_match_6 WHERE "away_team_score" = '18.13 (121)'

Question: What date did the Away team, North Melbourne, play Geelong?
SQL: SELECT "date" FROM t_1973_vfl_match_6 WHERE "away_team" = 'north melbourne'

Question: What Venue had an Away team score of 7.15 (57) on June 4, 1973?
SQL: SELECT "venue" FROM t_1973_vfl_match_6 WHERE "away_team_score" = '7.15 (57)'