user: Question: Name the average Against that has a Venue of Twickenham , London on 25 November 1978?
Columns: ['Opposing Team', 'Against', 'Date', 'Venue', 'Status']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Cambridge University', 12.0, '18 October 1978', 'Grange Road, Cambridge', 'Tour Match']
SQL:

assistant: SELECT AVG("Against") FROM "Table" WHERE "Venue" = 'Twickenham , London' AND "Date" = '25 November 1978';