A school has a total enrollment of 90 students. There are 30 students taking physics, 25 taking English, and 13 taking both. What percentage of the students are taking either physics or English? 30% 36% 47% 51% 58%

A school has a total enrollment of 90 students. There are 30 students taking physics, 25 taking English, and 13 taking both. What percentage of the students are taking either physics or English? 30% 36% 47% 51% 58%

我的思路是 30+25-13-13=29人 减去的第一个13是重复算了两次的 所以减去 第二个13是两门课都上的 然后29人就是要么上体育要么上英语的人数 求问老师我的思路错在哪里