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

### Instruction:
 一个水壶装有5升水，一个水桶装有4个水壶。2个水桶里有多少升水？


### Response:
 4个水壶装有4*(5=20)升水。
2个水桶里有20*(2=40)升水。