Question

In an exam 1/4 of the students failed both in English and maths 35% students failed in maths and 30% failed in English
1. Find the percentage of students who failed in any of the subjects
2. Find the percentage of students who passed in both the subjects
3. If the number of students who failed only in English was 25 find the total number of students

Answer 1

Students who failed in Eng and maths:

$25x \div 100$
...who failed in Maths:
$35x \div 100$
....who failed in english:
$30x \div 100$
1.Students who failed in any of the subjects:
$35x \div 100 + 30x \div 100$
$65 x \div 100$
65% failed on any of the subjects.

2.Students who passed are:
Total-Failed=Passed%
100%-65%=Passed%
Passed%=35%