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

### Instruction:
 鲍比想要吃煎饼作为早餐。盒子上的食谱可以做21个煎饼。当他吃了5个煎饼时，他的狗跳了起来，在被抓住之前吃了7个。鲍比还剩下多少个煎饼？


### Response:
 鲍比吃了5个煎饼，他的狗吃了7个，所以一共吃了5+7 = 12个。
食谱可以做21个煎饼，已经吃了12个，所以还剩下21-12 = <<21-12=9>>9个煎饼。