CREATE TABLE table_20757 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Ground" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the away team's score of at the game of telstra stadium?
SELECT "Away team score" FROM table_20757 WHERE "Ground" = 'Telstra Stadium'
SELECT "Away team score" FROM "table_20757" WHERE "Ground" = 'Telstra Stadium'