What was the away team's score when the crowd was larger than 16,500 and the home team scored 15.15 (105)?
CREATE TABLE "round_13" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "away_team_score" FROM "round_13" WHERE "crowd">'16,500' AND "home_team_score"='15.15 (105)';