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? Let's think first. Chain of thought:
The number of boxes already sold is 12 + 5 + 4 = 21. Kaylee needs to sell 33 21 = 12 more boxes.
Therefore, the answer is 12.