Apr. 14th, 2015

etherial: St. Basil's Cathedral, Moscow (St. Basil's)
There's a logic puzzle that's been going around that has a bunch of my friends stumped. I don't know if it's really from a primary school assignment in Singapore (the syntax certainly reflects Singapore's mixed heritage), but I solved more complicated logic puzzles all the time in elementary school, so maybe.

Albert and Bernard just become friends with Cheryl, and they want to know when her birthday is. 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 Bernard separately the month and the day of her birthday respectively.

Albert: I don't know when Cheryl's birthday is, but I know that Bernard does not know too.

Bernard: At first I don't know when Cheryl's birthday is, but I know now.

Albert: Then I also know when Cheryl's birthday is.

So when is Cheryl's birthday?

Answer behind the cut )

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