Sun Apr 11, 2010 6:25 pm by tartle 


Out of 52 cards 13 are up and 39 are down and are mixed .
How to arrange them in two decks of equal numbers of up.
Condition
You are sitting in a dark room and there is no light. 




Mon Jun 28, 2010 3:17 pm by shrek619 


can you give a small hint ? 




Tue Sep 21, 2010 8:55 am by lonewolf 


Saperate the piles into 2 equal piles of 26 cards each. Flip all the card of on pile. I think this question is simmilar to the 20 coin question. 




Wed Dec 29, 2010 11:33 am by moshu123 


The correct solution is like this:
Saperate the piles into 2 piles of 13 & 39 cards each. Flip all the card of smaller pile. 




Sat Feb 23, 2013 9:23 pm by chopstick 


divide in two pile one with 13 and other with 39.
flip the cards of pile 13.
explanation: say pile with 39 has x up cards so card with pile 13 has 13x up cards means it has x down cards so if u flip u will have x up cards same as pile with 39 cards 




Thu Jul 21, 2016 2:49 pm by bathfilms 


So far everyone has a correct solution that yields the same number UP in each pile.
However, Lonewolf's solution accomplishes this AND the same number DOWN in each pile.
Simply split into 2 equal piles and turn one upside down. 






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