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

### Instruction:
 有比Cayugas多4只Muscovy鸭，比Khaki Campbells多3只，是Cayugas的两倍多。如果总共有90只鸭子，那么有多少只Muscovy鸭？


### Response:
 Cayugas比Khaki Campbells多3只，所以Muscovy比Cayugas多4只
总共的鸭子数量是90只，所以Cayugas的数量是90 - 4 = <<90-4=86>>86
然后Khaki Campbells的数量是86 - 3 = <<86-3=83>>83
最后Muscovy的数量是86 + 4 = <<86+4=90>>90