For nations with more than 6 silvers and more than 10 golds, what is the lowest total?
CREATE TABLE "medal_table" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT MIN("total") FROM "medal_table" WHERE "silver">6 AND "gold">10;