Could you please tell me that this type of problems fall under what category ? and when we say that x people drink tea and cofee and y people drink tea then doesn't x include some part of y?So how can we simple add both of them ?

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Out of 100 students, 10 students used to drink milk(M), coffee(C) and Tea(T); 20M and C; 30C and T; 25M and T; 12M only; 5C only and 8T only. The number of students who did not drink any of this is

a) 18

b) 24

c) 20

d) 16

a) 18

b) 24

c) 20

d) 16

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