There are three chests, each of which contains 100 coins. One chest has 100 gold coins, one has 100 silver coins, and the third has an equal split of 50 gold coins and 50 silver coins.

Each chest is labelled, but all are labelled incorrectly. You are allowed to pick one coin from just one of the chests and after his you must correctly identify each of the three chests.

What should you do?
You can start by picking a coin from the first chest labeled "Gold". After that, look at the second chest labeled "Silver" and try to remember what was written on it. Then, move on to the last chest labeled "Gold/ Silver", where you will find two labels - one for "Gold" and another for "Silver". Based on your previous knowledge, you know that there is an even split between the two types of coins in this chest. So, take out a coin from the "Gold" label and compare its weight with the total weight of all the coins in the chest. If they match, then you have found the correct chest; if not, then continue looking until you find the right one.