CREATE TABLE table_74220 ("Episode Number" TEXT, "Episode Name" TEXT, "Airdate" TEXT, "Viewers  ( millions ) " TEXT, "Rank ( Timeslot ) " TEXT, "Rank 18\\u201349  ( Night ) " TEXT)

what is the total rank on airdate march 30, 2011?
SELECT COUNT("Rank(Timeslot)") FROM table_74220 WHERE "Airdate" = 'March 30, 2011'
SELECT COUNT("Rank(Timeslot)") FROM "table_74220" WHERE "Airdate" = 'March 30, 2011'