conversations.from: human
conversations.value: Provide a step by step solution for the following math problem: Dave bought 8 books about animals, 6 books about outer space, and 3 books about trains to keep him busy over the holidays. Each book cost $6. How much did Dave spend on the books?
conversations.from: assistant
conversations.value: Dave buys 8 books + 6 books + 3 books = 17 books in total.
  He has to spend 17 books × $6/book = $102 if he wants to buy all the books.