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

### Instruction:
 学校举办了一个吃馅饼比赛。亚当吃的馅饼比比尔多三个。西耶拉吃的馅饼是比尔的两倍。如果西耶拉吃了12个馅饼，总共吃了多少个馅饼？


### Response:
 比尔吃了12 / 2 = <<12/2=6>>6个馅饼。
亚当吃了6 + 3 = <<6+3=9>>9个馅饼。
他们总共吃了6 + 9 + 12 = <<6+9+12=27>>27个馅饼。