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

### Instruction:
 城市广场上有三棵树。最高的树高150英尺。中等高度的树是最高树的2/3。最矮的树是中等树的一半高。最矮的树有多高？


### Response:
 最高的树：150英尺
中等大小的树：(150/3)*2=100英尺
最矮的树：(100/2)=50英尺