五分之一对座的

例句：

1. 1. The total number of students in the class is five-fifths of the class.
   班上学生总数是班级人数的五分之五。
2. 2. This restaurant serves food at a price that's one-fifth of what it would cost elsewhere.
   这家餐馆的食物价格是其他地方的一半。
3. 3. If you divide 48 by 5, you get one-fifth of the answer.
   如果你把48除以5，你就得到了答案的一半。