Question: What is the total number of bronze medals of the nation with 4 total medals and 1 silver?
SQL: SELECT COUNT("Bronze") FROM "2-15987929-1" WHERE "Total" = 4.0 AND "Silver" = 1.0;

Question: What is the sum of silver medals of the nation cuba, which has less than 0 gold?
SQL: SELECT SUM("Silver") FROM "2-15987929-1" WHERE "Nation" = 'cuba' AND "Gold" < 0.0;