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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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