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

### Instruction:
 凯尔比朱利安大5岁。朱利安比弗雷德里克小20岁。弗雷德里克比泰森大两倍。如果泰森是20岁，那么凯尔多大？


### Response:
 弗雷德里克是20 * 2 = <<20*2=40>>40岁
朱利安是40 - 20 = <<40-20=20>>20岁
凯尔是20 + 5 = <<20+5=25>>25岁