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

### Instruction:
 云最初有20个回形针，但后来丢了12个。玛丽恩比云目前拥有的多1/4，再加上7个。玛丽恩有多少个回形针？


### Response:
 云有20-12= <<20-12=8>>8个回形针。
玛丽恩有8/4 + 7 = <<8/4+7=9>>9个回形针。