CREATE TABLE table_36720 ("Competition" TEXT, "Round" TEXT, "Opposition" TEXT, "Home Leg" TEXT, "Away Leg" TEXT)

What ist the Away Leg with an Opposition that is aarhus gymnastik forening?
SELECT "Away Leg" FROM table_36720 WHERE "Opposition" = 'aarhus gymnastik forening'
SELECT "Away Leg" FROM "table_36720" WHERE "Opposition" = 'aarhus gymnastik forening'