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

### Instruction:
At the bookstore, Sarah bought 6 paperback books and 4 hardback books. Her brother bought one-third as many paperback books as Sarah bought, and two times the number of hardback books that she bought. How many books did her brother buy in total?

### Response:
 พี่ชายของเธอซื้อหนังสือปกอ่อน 6/3=<<6/3=2>>2 เล่ม
เขาซื้อหนังสือปกแข็ง 4*2=<<4*2=8>>8 เล่ม
รวมกันเขาซื้อหนังสือทั้งหมด 2+8=<<2+8=10>>10 เล่ม