What is the highest rank for the country with 6 2nd runner ups?
CREATE TABLE "top_15_countries_by_tally" (
  "rank" real,
  "country" text,
  "miss_universe" real,
  "1st_runner_up" real,
  "2nd_runner_up" real,
  "3rd_runner_up" real,
  "4th_runner_up" real,
  "semifinalists" real,
  "total" real
);
SELECT MAX("rank") FROM "top_15_countries_by_tally" WHERE "2nd_runner_up"=6;