Suppose you have twelve balls, they all look the same. One of them has a different weight while the rest are identical.
You are given a scale that you can place two subgroups of the balls on it to see which subgroup is heavier. You can decide how many balls goes into each subgroup. You don't know the exact weight of each subgroup, but you are allowed to remember which balls belong to which subgroup (the heavier one or the lighter one).
The problem is that you have to find a way to single out the ball that has a different weight by using the scale only three times.
No formal education or special knowledge is required, but it does take some creative thinking. There are multiple answers, by the way.
A. If you can do this within one hour, you are extremely smart, maybe one in a million.
B. If you can do this within one day, you are still pretty smart.
C. If you did it in less than 10 minutes, then you are just lucky or you have done a similar problem before.
Answer is HERE: