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

### Instruction:
 卡拉的牧羊犬将她的羊群中的90%聚集在一起，但剩下的10%走失在山里。如果圈里有81只羊，有多少只在野外？


### Response:
 首先通过将圈里的羊数除以90%来找到总羊数：81只羊 / 90% = 90只羊
然后将该数乘以10%以找到在山里的羊数：90只羊 * 10% = <<90*10*.01=9>>9只羊