Human: 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? Assistant:
Amanda read 18/3 = 6 books.
Kara read 6/2 = 3 books.
Patricia read 7 x 3 = 21 books.