Question

In a university exam, 65% passed in english, 90% passed in hindi and 60% passed in optional subject. Find how many atleast should have passed in all the subject.

Answer 1

Given: 65% passed in english, 90% passed in hindi and 60% passed in optional subject

To Find: How many atleast should have passed in all the subject.

Solution:

Let the total no of students be 100, then

▪the total no of students who have passed in English, Hindi, and the Optional = 65+90+60=215

▪but there are only 100 students

▪the difference i e (215 - 100) = 115 may be due to (a) there are some students who have passed in 2 subjects (b) and there are some students who have passed in all the subjects

(a) the no of students who have passed in 2 subjects is not known , so

Assuming that there are no students who have passed in 2 subjects, the difference of 115  represents the no of students who have passed in all the 3 subjects