user: Question: What is the sum of silver medals for the entry with rank 3 and a total of 4 medals?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real']
Sample row: ['1', 'China', 8.0, 0.0, 0.0, 8.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Total" = 4.0 AND "Rank" = '3';