Candice read 3 times as many books as Amanda in their school's Book Tournament. Kara read half the number of books that Amanda read, and Patricia read 7 times the number of books that Kara read. If Candice read 18 books, how many books did Patricia read?
Amanda read 18/3 = 
<gadget id="calculator">18/3</gadget>
<output>6</output>
6 books.
Kara read 6/2 = 
<gadget id="calculator">6/2</gadget>
<output>3</output>
3 books.
Patricia read 7 x 3 = 
<gadget id="calculator">7*3</gadget>
<output>21</output>
21 books.

<result>21</result>