Table: t_1971_vfl_match_3
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What is the crowd size for Victoria park?
SQL: SELECT "crowd" FROM t_1971_vfl_match_3 WHERE "venue" = 'victoria park'

Question: What is the average crowd size for princes park?
SQL: SELECT AVG("crowd") FROM t_1971_vfl_match_3 WHERE "venue" = 'princes park'

Question: What is the home team score when the away team score is 17.18 (120)?
SQL: SELECT "home_team_score" FROM t_1971_vfl_match_3 WHERE "away_team_score" = '17.18 (120)'

Question: When the home team scored 12.21 (93), what was the average crowd size?
SQL: SELECT AVG("crowd") FROM t_1971_vfl_match_3 WHERE "home_team_score" = '12.21 (93)'