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

### Instruction:
 马克在网上购买了50集《老友记》。每天他观看他购买的集数的1/10。马克需要多少天才能完成他购买的50集节目？


### Response:
 马克每天观看5集，所以他需要50 / 5 = <<50/5=10>>10天才能完成他购买的所有集数。