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

### Instruction:
 玛德琳有48美元，她的弟弟有她的一半。他们一共有多少钱？


### Response:
 玛德琳的弟弟有48美元的一半 = 24美元。
他们一共有48美元 + 24美元 = 72美元。