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? Give me reasons, before answering the question
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. So the final answer is 102.