A normal sized table in front of you is covered with coins, all lying flat on the table. All of them are heads up, except three which are tail up.
You are blindfolded and have gloves on your hands, so you can not determine if a specific coin is heads or tail up.
Your task is now to divide the coins into two sets so that both sets have the same number of coins with tail up. You are allowed to turn as many coins as you like.