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

### Instruction:
 在一家餐厅里，厨师准备了17份午餐。午餐时，他卖出了12份。午餐后，厨师又准备了5份晚餐。假设他可以使用剩下的午餐份额，厨师晚餐有多少份？


### Response:
 午餐后，厨师还剩下17 - 12 = <<17-12=5>>5份餐。
所以，厨师晚餐有5 + 5 = <<5+5=10>>10份餐。