Table: fa_cup_matches_20
Columns: tie_no
home_team
score
away_team
attendance

Question: On what day was the attendance that had a Tie value of 40?
SQL: SELECT "attendance" FROM fa_cup_matches_20 WHERE "tie_no" = '40'

Question: Who was the home team for the away game that Canvey Island played?
SQL: SELECT "home_team" FROM fa_cup_matches_20 WHERE "away_team" = 'canvey island'

Question: On what day was there a Home game for Gillingham?
SQL: SELECT "attendance" FROM fa_cup_matches_20 WHERE "home_team" = 'gillingham'