a school has a total enrolment of 90 students. there are 30 students taking physics, 25 taking english and 13 taking both. what percentage of the students is either taking physics or english?

To find the percentage of students who are taking either physics or English, we need to calculate the total number of students taking either subject.

Let's break down the given information:

Total enrollment: 90 students
Number of students taking physics: 30 students
Number of students taking English: 25 students
Number of students taking both physics and English: 13 students

To find the total number of students taking either physics or English, we can add the number of students taking physics and the number of students taking English, and then subtract the number of students taking both (to avoid double-counting):

Total students taking either physics or English = Number of students taking physics + Number of students taking English - Number of students taking both

Total students taking either physics or English = 30 + 25 - 13
= 42 students

Now we can calculate the percentage of students taking either physics or English:

Percentage of students taking either physics or English = (Total students taking either physics or English / Total enrollment) * 100

Percentage of students taking either physics or English = (42 / 90) * 100
= 46.67%

Therefore, approximately 46.67% of the students in the school are taking either physics or English.