Since the chest that is labeled as MIXTURE
is intentionally mislabeled, it is either a chest of with 2 bags of gold coins or a chest
of with 2 bags of silver coins. So, as the knight, you open one bag from
this chest. The type of coins in this bag determines the
type of coins in the other bag. If this bag contains gold coins, this is the chest to bring home.
If this bag contains silver coins, then this chest
contains all silver coins. Since, the box that was mislabeled ALL
GOLD cannot contain gold coins on both bags, the box mislabeled
ALL SILVER must contain gold coins on both bags.