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

### Instruction:
 杰克和他的朋友一起分享了8杯伏特加。每杯伏特加是1.5盎司。如果伏特加是50%的纯酒精，杰克喝了多少纯酒精？


### Response:
 杰克喝了8/2=<<8/2=4>>4杯。
所以他喝了4*1.5=<<4*1.5=6>>6盎司的伏特加。
所以他喝了6*.5=<<6*.5=3>>3盎司的纯酒精。