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

### Instruction:
 罗伯特有25个球。蒂姆给了他自己40个球的一半。现在罗伯特有多少个球？


### Response:
 蒂姆给了罗伯特1/2 * 40个球 = <<1/2*40=20>>20个球。
现在罗伯特有25个球 + 20个球 = <<25+20=45>>45个球。