CREATE TABLE table_55811 ("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 the team that played an away game at North Melbourne?
SELECT "Home team score" FROM table_55811 WHERE "Away team" = 'north melbourne'
SELECT "Home team score" FROM "table_55811" WHERE "Away team" = 'north melbourne'