conversations.from: human
conversations.value: Fred had 212 sheets of paper. He received another 307 sheets of paper from Jane and gave Charles 156 sheets of paper. How many sheets of paper does Fred have left?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: He had 212 sheets and received 307 more for a total of 212+307 = 519 sheets
  He gave out 156 so he has 519-156 = 363 sheets