Veritas数学题求教。。

SW88

The student-professor ratio at a certain university was 25:4, but when the university expelled eighty students for acts of civil disobedience, seventeen professors quit in protest. Which of the following could be the new student-professor ratio at the university?

A. 63:12
B. 95:17
C. 33:5
D. 55:6
E. 55:3


正确答案是3，看完了答案也一脸懵逼。。。Veritas的mock数学是难的逆天么。。。

求数学nn指教！

ginger200800113

我也做到了这道题 当时是把每一个选项带进去试的 设人数分别是25a和4a 只有C里面的a是整数
然而后面根本没做完 整体正确率71%然而Q还是51 看来Veritas数学的难度真是。。。