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

### Instruction:
 一名四分卫在比赛中后退80次来投球。30%的时间他没有投球。其中一半没有投球的时间他被抓住失去码数。四分卫在比赛中被抓住失去码数多少次？


### Response:
 没有投球的次数：80(.30)=24
被抓住失去码数的次数：24/2=<<24/2=12>>12