CREATE TABLE table_45357 ("Team" TEXT, "Tries for" TEXT, "Tries against" TEXT, "Try diff" TEXT, "Points for" TEXT, "Points against" TEXT, "Points diff" TEXT)

What is Tries Against, when Tries For is 20?
SELECT "Tries against" FROM table_45357 WHERE "Tries for" = '20'
SELECT "Tries against" FROM "table_45357" WHERE "Tries for" = '20'