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

### Instruction:
 一个供应商正在打包装满20罐果汁的纸箱。在已经打包好的50个纸箱中，只有40个纸箱被装上了卡车。还有多少罐果汁需要装上卡车？


### Response:
 还有10个纸箱的果汁需要装上卡车。
这相当于10个纸箱 x 20罐 = <<10*20=200>>200罐果汁。