conversations.from: human
conversations.value: I need help with this problem:
  Jayden had $70 from selling pictures he took as a hobby.  His sister Ava gave him half of her $90 allowance to help him buy a new camera that costs $200. How much more does Jayden need to buy the camera?
conversations.from: assistant
conversations.value: Ava gave $90/2 = $45 to Jayden.
  Jayden now has $70 + $45 = $115
  So, Jayden needs $200 - $115 = $85 to buy the new camera