conversations.from: human
conversations.value: I'm completely lost with this math problem: Rex is taking lessons for his driver’s license. He wants to take 40 hour-long lessons before his test, and decides to have two-hour sessions twice a week until he has done his test. After 6 weeks, how many more weeks will Rex need to continue taking lessons to reach his goal?
  Can you give me a hand?
conversations.from: assistant
conversations.value: Each week, Rex is taking 2 hour-long lessons * 2 times a week = 4 lessons.
  After 6 weeks, he has done 4 lessons per week * 6 weeks = 24 lessons.
  So Rex still needs 40 total lessons – 24 lessons taken = 16 lessons.
  He will therefore need lessons for another 16 lessons / 4 lessons per week = 4 weeks.