There was once a king who is supposed to reward one of his knights. However, the king has reservations. So instead of rewarding him a chest of gold coins, he prepared three treasure chests, labeled as ALL GOLD, ALL SILVER, and MIXTURE. However, the king intentionally mislabeled these treasure chests to mislead the knight. Each chests contains 2 bags of coins. One chest contains gold coins on both bags. Another chest contains silver coins on both bags. The third chest has gold coins in one bag, and silver coins on another bag. The knight is allowed only to open only one bag of only one chest. After which, he has to decide which treasure chest he can bring home as reward. If you were the knight, from which treasure chest should you open a bag, so that you can bring home the chest with two bags of gold coins.