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

### Instruction:
Joey has 30 pages to read for history class tonight. He decided that he would take a break when he finished reading 70% of the pages assigned. How many pages must he read after he takes a break?

### Response:
 โจอี้จะพักหลังจากอ่านหน้าที่ 30 * 0.7 = <<30*0.7=21>>21 หน้า
โจอี้เหลืออ่านอีก 30 - 21 = <<30-21=9>>9 หน้า