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

### Instruction:
 根据医生的建议，南希现在每天喝水的量相当于她体重的60%。如果南希每天喝水54磅，那么她的体重是多少磅？


### Response:
 假设南希的体重为x
我们知道60/100 * x = 54磅
为了解x，我们将两边都乘以100/60，得到x = 54 * 100/60 = 90磅