求助PREP中的一道题

sweetcorns

遇到这么的题目特别头晕，请教列方程的思路应该怎样？谢谢

To clebrate a collegue's retirement,  "T"  coworkers agree to share the cost of a lunch. If the lunch cost total "X" dollars, and "S" coworkers fail to pay their share. Which of the following represent the amount of dollars that each of the remanining coworkers would have to pay so that the lunch is completely paid?

1. X/T   

2.X/(T-S)

3.SX/(T-S)

4.SX/T(T-S)

5.X(T-S)/T

himba

楼主不要紧张啊，这个题目很简单的，就选2呀。

我把题目翻译一遍给你。你就知道了。

T个人同意付午餐的钱，一共要花X的钱，在这T个同意付钱的人中，有S个人不付了。问你剩下来的人每人付了多少钱呀。

那么就是X/（T-S）。

T-S就是最后实际付钱的人。。

楼主不要太紧张了！把心态放好。题目多看看，不用把它想得很复杂。

sweetcorns

实在对不起，题目因该是

To clebrate a collegue's retirement,  "T"  coworkers agree to share the cost of a lunch. If the lunch cost total "X" dollars, and "S" coworkers fail to pay their share. Which of the following represent the additional amount of dollars that each of the remanining coworkers would have to pay so that the lunch is completely paid?

答案是4 ， 请帮忙

himba

那也很简单阿,

不就是现在要付的钱-本来要付的钱=多出来要付的钱吗

现在要付的钱: X/T-S

本来要付的:  X/T

两个减一减,化简就是答案4了

原来ETS那么阴险,还additional,HOHO~~~

sweetcorns

many  thanks !!!!!!!!!!!!!