Read the riddle and answer the question.
A stranger gives you 9 coins.
They all look absolutely identical, but one of the coins is fake.
However, you know that the fake coin is lighter than the rest.
You have a balance scale.
What is the least number of time that you will have to weigh to find the counterfeit coin?
So were you able to solve the riddle? Leave your answers in the comment section below.
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First, divide the coins into 3 equal parts of 3 coins each.
Place a pile on each side of the scale, leaving the remaining pile of 3 coins off the scale.
If the scale does not tip, you know that the 6 coins on the scale are legitimate, and the counterfeit is in the pile in front of you.
If the scale does tip, you know the counterfeit is in the pile on the side of the scale that rose up.
Either way put the 6 legitimate coins aside.
Having only 3 coins left; put a coin on each side of the scale, leaving the third in front of you.
The same process of elimination will find the counterfeit coin.