conversations.from: human
conversations.value: Can you explain how to solve this math problem: Cameron is printing her thesis in the school library and has 400 A4 pieces of paper. If 40% of the papers did not print out up to her desired quality and she separated them as invalid, calculate the total number of valid documents.
conversations.from: assistant
conversations.value: If she had 400 papers, the total number of documents she separated as invalid is 40/100 * 400 pages = 160 pages.
  The number of valid documents is 400 pages - 160 pages = 240 pages