What is the total number of bronze medals of the team with more than 8 silvers and a total of 50 medals?
CREATE TABLE "medal_table_2006_2009" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT COUNT("bronze") FROM "medal_table_2006_2009" WHERE "silver">8 AND "total"=50;