user: Question: What is the highest average that has 6 dances and a total of over 128?
Columns: ['Rank by average', 'Place', 'Couple', 'Total', 'Number of dances', 'Average']
Types: ['real', 'real', 'text', 'real', 'real', 'real']
Sample row: [1.0, 2.0, 'John & Charlotte', 199.0, 8.0, 24.8]
SQL:

assistant: SELECT MAX("Average") FROM "Table" WHERE "Number of dances" = 6.0 AND "Total" > 128.0;