英语数学题意思不太明白.during a sale at an office supply store,for ever
英语数学题意思不太明白.
during a sale at an office supply store,for every box of paper clips purchased for 15cents,a second box can purchased for 4cents.How many boxes of paper clips did Paul buy if he spent 91cents on boxes of paper clips?
那个 a second box ,翻译为第二盒么?