CREATE TABLE table_54551 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Which home team score has an Away team score of 15.9 (99)?
SELECT "Home team score" FROM table_54551 WHERE "Away team score" = '15.9 (99)'
SELECT "Home team score" FROM "table_54551" WHERE "Away team score" = '15.9 (99)'