user: Question: What opposing team has 20 against?
Columns: ['Opposing Team', 'Against', 'Date', 'Venue', 'Status']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Wellington', 9.0, 'May 18,1963', 'Athletic Park , Wellington', 'Tour match']
SQL:

assistant: SELECT "Opposing Team" FROM "Table" WHERE "Against" = 20.0;