conversations.from: human
conversations.value: Phil likes to collect baseball cards.  He buys a pack of twenty each week for a year, but then loses half of them one day in a fire.  How many baseball cards does Phil have left?
  Solve this problem.
conversations.from: assistant
conversations.value: Since there are 20 cards in a pack and 52 weeks in a year, Phil starts by collecting 20*52= 1040 baseball cards
  He then loses half of them for 1040/2= 520 cards remaining.