user: Question: How big was the crowd when the home team scored 20.21 (141)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '13.17 (95)', 'South Melbourne', '6.5 (41)', 'Kardinia Park', 22000.0, '21 April 1951']
SQL:

assistant: SELECT "Crowd" FROM "Table" WHERE "Home team score" = '20.21 (141)';