conversations.from: human
conversations.value: I'm stuck on this math problem: At a bus station, a bus leaves every half-hour for 12 hours a day. How many buses leave the station for 5 days?
  Can you help?
conversations.from: assistant
conversations.value: If one bus leaves every half-hour, then during one hour, there are 1 + 1 = 2 buses that leave the station.
  During 5 days 2 * 12 * 5 = 120 buses leave the station.