关于比例的。。。

awallcanbebuiltby6menworking8hoursperdayin5days.howmanydayswilllittake4mentobuldthewalliftheyworkonly5hoursperday??忘了怎么设这个比例。。是不是6：40=4：5x啊？？笨死了我。... a wall can be built by 6 men working 8 hours per day in 5 days. how many days willl it take 4 men to buld the wall if they work only 5 hours per day??忘了怎么设这个比例。。是不是6：40=4：5x 啊？？笨死了我。。各位帮帮忙啊。。。最好写出过程。。。 展开