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?
Dave buys 8 books + 6 books + 3 books = 
<gadget id="calculator">8+6+3</gadget>
<output>17</output>
17 books in total.
He has to spend 17 books * $6/book = $
<gadget id="calculator">17*6</gadget>
<output>102</output>
102 if he wants to buy all the books.

<result>102</result>