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

### Instruction:
 杰夫正在收集火柴盒车。他有卡车数量的两倍的车。他总共有60辆车。他有多少辆卡车？


### Response:
 卡车与车的比例是1:2。
代表卡车的分数是1/3，因为1/(1+2) = 1/3
他有20辆卡车，因为60 x (1/3) = <<60*(1/3)=20>>20