CREATE TABLE table_25404 ("Season" FLOAT, "Episodes" FLOAT, "Timeslot  ( ET ) " CLOB, "Season Premiere" CLOB, "Season Finale" CLOB, "TV Season" CLOB, "Rank" CLOB, "Viewers  ( in millions ) " CLOB)

How many rankings were there for the season with a finale on August 20, 2011?
SELECT COUNT("Rank") FROM table_25404 WHERE "Season Finale" = 'August 20, 2011'
SELECT COUNT("Rank") FROM "table_25404" WHERE "Season Finale" = 'August 20, 2011'