conversations.from: human
conversations.value: Raul had $87 to spare so he decided to go to the bookshop. Raul bought 8 comics, each of which cost $4. How much money does Raul have left?
  What is the solution?
conversations.from: assistant
conversations.value: He spent 8 comics × $4/comic = $32 on comics.
  Raul has $87 - $32 = $55 left.