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

### Instruction:
 在一场篮球比赛中，赛勒斯成功命中了他尝试的百分之八十的投篮。他尝试了二十次投篮。他错过了多少次投篮？


### Response:
 赛勒斯成功命中了20 x 80/100 = <<20*80/100=16>>16次投篮。
所以，他错过了20 - 16 = <<20-16=4>>4次投篮。