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

### Instruction:
 一个吸血鬼每周需要吸食7加仑的血才能生存。如果他每个人吸食2品脱的血，他每天需要吸食多少人的血才能生存？


### Response:
 每天它需要消耗7/7=<<7/7=1>>1加仑的血液
每加仑有128/16=<<128/16=8>>8品脱
所以它每天需要从4/2=<<8/2=4>>4个人吸食血液