conversations.from: human
conversations.value: Break down this math problem: Mike's teacher, leaves as homework the reading of a 200-page book. The assignment is to be completed within 30 days. Mike plans to read 10 pages a day. How many days before the deadline will Mike finish his reading?
conversations.from: assistant
conversations.value: Reading 10 pages per day, Mike finishes reading his book in 200 ÷ 10 = 20 days.
  Mike finishes reading his book 30 - 20 = 10 days before the deadline.