conversations.from: human
conversations.value: I need help with this problem:
  Quinton brought 40 cupcakes to school on his birthday. He gave a cupcake to each of the 18 students in Ms. Delmont's class. He also gave a cupcake to each of the 16 students in Mrs. Donnelly's class. He also gave a cupcake to Ms. Delmont, Mrs. Donnelly, the school nurse, and the school principal. How many cupcakes did he have left over?
conversations.from: assistant
conversations.value: Quinton had 40 cupcakes - 18 = 22 cupcakes.
  He then had 22 cupcakes - 16 students = 6 cupcakes.
  Quinton then gave away 6 - 1 -1 -1 -1 = 2 cupcakes left.