CREATE TABLE table_77924 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is north melbourne's score as an away side?
SELECT "Away team score" FROM table_77924 WHERE "Away team" = 'north melbourne'
SELECT "Away team score" FROM "table_77924" WHERE "Away team" = 'north melbourne'