Give the step-by-step reasoning process and then the final answer. 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 = 6 books. Kara read 6 / 2 = 3 books. Patricia read 7 x 3 = 21 books.
The final answer: 21.