Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
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?

### Response:
 อแมนดาอ่านหนังสือ 18/3 = <<18/3=6>>6 เล่ม
คาร่าอ่านหนังสือ 6/2 = <<6/2=3>>3 เล่ม
พาทริเซียอ่านหนังสือ 7 x 3 = <<7*3=21>>21 เล่ม