CREATE TABLE table_57057 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Which Crowd has an Away team score of 9.21 (75)?
SELECT SUM("Crowd") FROM table_57057 WHERE "Away team score" = '9.21 (75)'
SELECT SUM("Crowd") FROM "table_57057" WHERE "Away team score" = '9.21 (75)'