[Viral] When is Cheryl Birthday? Details Solution - Toughest Maths Questions for Asian students that stumps over Internet.

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In this Question no. 24 asked is when is Cheryl Birthday?

lets have a detail question 

Albert and Bermad just become Friends with Cheryl, and they want to know her birthday is. 

Then Cheryl gives them a list of 10 possible dates.

May 15    May 16      May 19
June 17   June 18
July 14    July 16
August 14 August 15  August 17

Cheryl then tells Albert and Bermad separately the month and the day of her birthday respectively. 

Conditions :
1. Albert : I don't know when Cheryl birthday is, but I know that Bermad does not know too.
2. Bermad : At first i don't know when is Cheryl birthday is, but i know now. 
3.  Albert : then i also knows when Cheryl birthday is.

So when is Cheryl's birthday? 

Solution :