Can you solve the coin flip puzzle? This fun brain teaser (or trick, even) can be performed in any setting, and the same principle will apply. You have 11 coins, and each coin has a white side and a black side. Five of the coin are currently white side up, and the other six coins are black side up. How can you separate the coins into two piles, each with the same number of white sides showing, all while your eyes are shut?