What was the away team score when the home team score was 11.18 (84)?
CREATE TABLE "round_18" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "date" text
);
SELECT "away_team_score" FROM "round_18" WHERE "home_team_score"='11.18 (84)';