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

### Instruction:
 约翰决定买餐具。它们是以30包为单位出售的，每包里有相同数量的刀、叉和勺子。如果他想要50个勺子，他需要买多少包？


### Response:
 每包里有30/3=<<30/3=10>>10个勺子
所以他需要买50/10=<<50/10=5>>5包