CREATE TABLE table_27109 ("Episode Number" FLOAT, "Location" TEXT, "Original Airdate" TEXT, "Challenge Winner" TEXT, "Challenge" TEXT)

How many original air dates were there for episode 22?
SELECT COUNT("Original Airdate") FROM table_27109 WHERE "Episode Number" = '22'
SELECT COUNT("Original Airdate") FROM "table_27109" WHERE "Episode Number" = '22'