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

### Instruction:
 亚当、安德鲁和艾哈迈德都养山羊。亚当有7只山羊。安德鲁的山羊数量是亚当的两倍加5只。艾哈迈德比安德鲁少6只山羊。艾哈迈德有多少只山羊？


### Response:
 安德鲁有5+2(7)=19只山羊
艾哈迈德有19-6=<<19-6=13>>13只山羊