Table: challenge_episodes
Columns: episode_number
location
original_airdate
challenge_winner
challenge

Question: What location did the episode that aired originally on August 26, 2009 take place at?
SQL: SELECT "location" FROM challenge_episodes WHERE "original_airdate" = 'August 26, 2009'

Question: How many dates originally aired episodes located in Philadelphia, pennsylvania?
SQL: SELECT COUNT("original_airdate") FROM challenge_episodes WHERE "location" = 'Philadelphia, Pennsylvania'

Question: What was the challenge for episode 28?
SQL: SELECT "challenge" FROM challenge_episodes WHERE "episode_number" = 28

Question: How many original air dates were there for episode 22?
SQL: SELECT COUNT("original_airdate") FROM challenge_episodes WHERE "episode_number" = 22