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

### Instruction:
 在一个泳池派对上，有4个披萨，每个披萨切成12片。如果客人吃了39片，还剩下多少片？


### Response:
 总共有4 x 12 = <<4*12=48>>48片。
客人吃完后，还剩下48 - 39 = <<48-39=9>>9片。