OG 11th 138 句意请教

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？><

感谢你，我刚刚也google寻找what
fraction of的意思

蓝色表分母

•   
What fraction of all the
boxes loaded by the two crews did the day crew load?

•   What fraction of the total number of
contestants was the number of female contestants in the second
competition?

        则第二届女参赛者的数目占全部参赛者的几分之几？