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

### Instruction:
 弗兰克在后院有一棵苹果树。树上有5个苹果，地上有8个苹果。如果弗兰克的狗吃掉了地上的3个苹果，还剩下多少个苹果？


### Response:
 弗兰克原本有5 + 8 = <<5+8=13>>13个苹果。
狗吃掉3个后，还剩下13 - 3 = <<13-3=10>>10个苹果。