conversations.from: human
conversations.value: This math problem has got me stumped: Liza reads 20 pages in an hour, and Suzie reads 15 pages in an hour. How many more pages does Liza read than Suzie in 3 hours?
  Can you show me the way?
conversations.from: assistant
conversations.value: In 3 hours, Liza reads 20 x 3 = 60 pages.
  In 3 hours, Suzie reads 15 x 3 = 45 pages.
  Liza reads 60 - 45 = 15 pages more than Suzie.