What was the ranking for the episode number before 24 that had a rating of 25.7?
CREATE TABLE "season_ratings" (
  "season" text,
  "ep_num" real,
  "season_premiere" text,
  "season_finale" text,
  "ranking" text,
  "viewers_households_in_millions" text,
  "rating" text
);
SELECT "ranking" FROM "season_ratings" WHERE "ep_num"<24 AND "rating"='25.7';