conversations.from: human
conversations.value: Méliès bought 2 kg of meat. The meat costs $82 per kilogram. Méliès has $180 in his wallet. How much money does he have left after paying for the meat?
  Solve it.
conversations.from: assistant
conversations.value: Méliès paid 2 x $82 = $164 for the 2 kg of meat.
  So he has $180 – $164 = $16 left.