conversations.from: human
conversations.value: Isabel has $204 in her piggy bank. She spent half the amount and bought a toy. She then spent half of the remaining money and bought her brother a book. How much money, in dollars, was left over?
conversations.from: assistant
conversations.value: After buying the toy, Isabel has 204/2=102 dollars left.
  Isabel has 102/2=51 dollars left.