A middle school took all of its 6th grade students on a field trip to see a ballet at a theater that has 3600 seats. The students left 63% of the seats in the theater vacant. How many 6th graders went on the trip?

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?