# Coin Problem - Which is the counterfeit coin???

This is my Maths homework, and I really can’t figure out the answer.

I have 12 identical coins. One of them is counterfeit. The counterfeit coin may be lighter or heavier than a genuine coin. If I have a balance, how do I find the counterfeit coin within 3 weighings?

Related posts:

1. Which coins are Counterfeit or Real? Ok i recieved this problem and i have been stuck on this. Heres the problem : There are 12 identical coins, 1 is counterfeit. This counterfeit can be either LIGHTER...
2. The counterfeit coins? You have 10 stacks of coins and each stack contains 10 coins. One complete stack of coins is counterfeit. You know the weight of each genuine coin and you know...
3. You have 12 coins with the same appearance, but one is counterfeit.? You don’t know if the counterfeit coin is heavier or lighter than the others, and you only have a pan balance. What’s the minimum number of weighings to determine the...
4. you are given 5 coins and a balance scale. The coins look alike but one is counterfeit and either heavier ….? you are given 5 coins and a balance scale. The coins look alike but one is counterfeit and either heavier or lighter than the others. Find the counterfeit coin using...
5. You have 30 gold coins but one is counterfeit and lighter than a real coin. The only equipment you have is…? Use lateral thinking. You have 30 gold coins but one is counterfeit and lighter than a real coin. The only equipment you have is a simple pair of balance scales....