conversations.from: human
conversations.value: This math problem has got me stumped: Josie received $50 as a gift. She plans to buy two cassette tapes that cost $9 each and a headphone set that costs $25. How much money will she have left?
  Can you show me the way?
conversations.from: assistant
conversations.value: The cassette tapes will cost 2 × 9 = $18.
  She spends 18 + 25 = $43 in total.
  Josie will have 50 - 43 = $7 left.