Puzzle 39 | (100 coins puzzle)

This puzzle is similar to 10 Coins Puzzle
  
Question: 100 coins are lying flat on a table. 10 of them are heads up and 90 are tails up.You can’t see which one is which.How can we split the coins into two piles such that there are same number of heads up in each pile?

Note: It is allowed to flip the coins of one pile once.
  
Answer: Make 2 piles with 10 coins and 90 coins each. Now, flip all the coins in the smaller pile. 
  
Explanation

Let’s consider a case 
Pile 1: 88T, 2H 
Pile 2: 2T, 8H 
  
Flipping the coins in Pile 2 
  
Pile 1: 88T, 2H 
Pile 2: 2H, 8T 
  
Pile 1(heads) = Pile 2(heads) 
  
This article has been contributed by Vikash Kumar
  
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above
 you are allowed to flip the pile once? 

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