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

### Instruction:
Lana had 8 blank pages left in her binder, but she knew she would need more for her next class. Duane took half of the 42 pages in his binder out and gave them to her. How many pages does Lana have in her binder after adding Duane’s?

### Response:
 ดวนให้ลาน่าหน้า 42 / 2 = <<42/2=21>>21 หน้า
หลังจากที่ดวนให้ลาน่า เธอจะมีหน้าในไดอารี่ 21 + 8 = <<21+8=29>>29 หน้า