Jawaban:

July 16

Penjelasan dengan langkah-langkah:

The answer can be found by slowly eliminating the impossible dates. One of the solutions put forward by Alex Bellos in The Guardian newspaper, Alex's solution is described as follows:

Albert: I don't know when Cheryl's birthday is, but I know that Bernard doesn't know either

All Albert knows is the month, and each month has more than one possible date, so of course he wouldn't know them. This first part is too much.

The only way for Bernard to immediately know the date is for Cheryl to tell him the 18 or 19, this is because of the ten possibilities, the number only appears once, namely 19 May and 18 June.

Since Albert knows that Bernard does not know it, then Albert may be notified between July or August on the basis of the above statement. Therefore all possibilities in May and June were eliminated.

Bernard: At first I didn't know when Cheryl's birthday was, but now I know

Bernard has already concluded that Albert was notified between July or August. In the above conversation Bernard states that he knows the exact date, it can be concluded that Bernard was told between the 15th, 16th, or 17th, this is because the 15th, 16th, or 17th refers to a specific month, while the 14th refers to the two months the.

Albert: I also finally found out when Cheryl's birthday

Albert has also concluded that the possible dates are July 16 and August 15 or 17. For him to know the exact date, he must have been told July, this is because if he was told August, he would not know the exact date.

Therefore, the answer to the riddle is July 16.

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