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 Very Difficult Logic Problems Out of 52 cards 13 are up and 39 are down and are mixed
 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 13-x 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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