Question

in a group of 50 persons 14 drink tea but no coffee and 30 drink tea. find:
(a) how many drink tea and coffee both
(b) how many drink coffee but not tea

Answer 1

let X :- Drinks tea
Y:- Drink Both of them
Z:- Drink Coffee
Now here give

X+Y+Z =50
And X=14
X+Y =30

So,
Y = 30-X= 30 -14 = 16
Now For Z

X+Y+Z =50
14+16+Z=50
Z=20
A》 answer will be 16
B》 answer will be 20