Question

in hostel there are 125 student out of which 80 drink tea 60 drink coffee and 20 drink tea and coffee both find the number of students who do not drink tea or coffee

Answer 1

n (U)=125
n (A)=80 (tea)
n (B)=60(coffee)
n(A intersection B)=20 (both tea and coffee)
n (AUB)=n (A)+n (B)-n (A intersection B)
=80+60-20
=120
People who do not drink tea or coffee =125-120
=5

Answer 2

The total no of students in hostel : 125
to find: how many students do not drink tea or coffee.

students drink coffee: 60
students drink tea : 80
students drink both : -20
total : 120

students do not drink any thing (x)=total no of students - total no of students drink

=) x=125-120
=) x=5


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