Of the students in a school, 20 percent are in the science club and 30 percent are in the band. If 25 percent of the students in the school are in the band but are not in the science club, what percent of the students who are in the science club are not in the band?
是不是画一个文氏图就出来了呢,两个圆交集是5%,所以答案是15%
恭喜你愉快的被坑了……
注意题目问的是students who are in the science club are not in the band,也就是说在科学组里面有多少百分比的人不在乐队,而不是我自己YY出来的who are in the science club but not in the band有多少人在科学组但是不在乐队