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

### Instruction:
 弗兰克的饼干数量是迈克的一半减去三个。迈克的饼干数量是米莉的三倍。如果米莉有4个饼干，那么弗兰克有多少个饼干？


### Response:
 迈克有4 * 3 = <<4*3=12>>12个饼干。
弗兰克有12 / 2 - 3 = <<12/2-3=3>>3个饼干。