user: Question: What is the total amount of gold medals when there were more than 20 silvers and there were 135 bronze medals?
Columns: ['Rank', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'real', 'real', 'real', 'real']
Sample row: ['1', 186.0, 173.0, 135.0, 494.0]
SQL:

assistant: SELECT SUM("Gold") FROM "Table" WHERE "Silver" > 20.0 AND "Bronze" = 135.0;