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Albert and Bernard just became friends with Cheryl, and they want to know when her b-day is.... Cheryl gives them a list of 10 possible dates.

May 15 16 19

June 17 18

July 14 16

Aug 14 15 17

Cheryl then tells Albert and Bernard separately the month and the day of her b-day, respectively....."when is Cheryl bday"!!?-_-


Interesting... I like it

It's July 16

So how??
First of all the unique dates are erased because it is not possible for both of them to guess the birth date. So, Now You have
May 15 16
June 17
July 14 16
Aug 14 15 17

Also the complete months May and June are erased because If both know the b'day it was either May 19 or June 18, which is not. So, Now You have
July 14 16
Aug 14 15 17

Now note that 14 is repeated so it is not possible for both of them to know the birth date but obviously they know, so it erases the option July 14 and Aug 14. So, Now You have
July 16
Aug 15 17

Now Aug is ambiguous, So JULY 16

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