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

### Instruction:
 兰多夫比悉尼大5岁。悉尼的年龄是雪莉的两倍。如果雪莉今年25岁，兰多夫多大？


### Response:
 悉尼的年龄是25*2 = <<25*2=50>>50岁
兰多夫比悉尼大5岁，所以他今年55岁。