conversations.from: human
conversations.value: I need a clearer understanding of how to solve: Kaylee needs to sell 33 boxes of biscuits. So far, she has sold 12 boxes of lemon biscuits to her aunt, 5 boxes of chocolate biscuits to her mother, and 4 boxes of oatmeal biscuits to a neighbor. How many more boxes of biscuits does Kaylee need to sell?
conversations.from: assistant
conversations.value: The number of boxes already sold is 12 + 5 + 4 = 21.
  Kaylee needs to sell 33 − 21 = 12 more boxes.