CREATE TABLE table_54420 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the Home team score for Geelong, whereby the Away team has a score of 18.13 (121)?
SELECT "Home team score" FROM table_54420 WHERE "Away team score" = '18.13 (121)'
SELECT "Home team score" FROM "table_54420" WHERE "Away team score" = '18.13 (121)'