How big of a crowd was attending the game whose Away team scored 9.10 (64)?
CREATE TABLE "round_15" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "crowd" FROM "round_15" WHERE "away_team_score"='9.10 (64)';