At a loading dock, each worker on the night crew loaded 3/4 as many boxes as each worker on the day crew. If the night crew has 4/5 as many workers as the day crew, what fraction of all the boxes loaded by the two crews did the day crew load? 我对这题数学翻译意思不太懂，我试着翻，蓝色部分请各位指教！谢谢
在一个装货的码头上，夜班的每一个工人可以装3/4箱子等同于一个日班的工人。如果晚班工作人员有等同日班4/5的工人数，那所有的箱子被(two crews)两个日夜班的工作人员除以日班人员的分数是多少？ thank you for your reply 老实说，我不太懂这题问什么？>< | 
