Question

There Are three type of persons who talks in three different language(hindi,bengali,english) ,,,

31 person talks in English
36 person in hindi
27 person in bengali
in them,10 people can talk english and hindi both,9 can english and bengali both,and 11 can hindi and bangali that two language..

prove that in them there are maximum 64 persons.
[11 science,,set theory]
(don't give Silly ANSWER)

plz help friends...

Answer 1

31+36+27 =94 and then 10+9+11=30 and then we have to be subtract 94-30 and then=64