user: Question: What was the average of the team if they played 31 games from 1990-1991?
Columns: ['Team', 'Average', 'Points', 'Played', '1988-89', '1989-90', '1990-1991']
Types: ['text', 'text', 'real', 'real', 'text', 'text', 'real']
Sample row: ['Boca Juniors', '1.254', 143.0, 114.0, '49', '43', 51.0]
SQL:

assistant: SELECT "Average" FROM "Table" WHERE "1990-1991" = 31.0;