conversations.from: human
conversations.value: If Mark weighs 150 pounds and Susan weighs 20 pounds less than Mark.  And their friend Bob weighs twice as much as Susan.  What is the average weight of the 3 friends?
conversations.from: assistant
conversations.value: Susan weighs 150 pounds - 20 pounds = 130 pounds.
  Bob weighs 2 * 130 pounds = 260 pounds.
  The friends total weight is 150 + 130 + 260 pounds = 540 pounds.
  The friends' average weight is 540 pounds / 3 = 180 pounds.