Is It Possible to Counterfeit Coins?
Take a look at a detailed examination about Is It Possible to Counterfeit Coins.
The twelfth is very slightly heavier or lighter. 3) The only available weighing method is the balance scale. It can only tell you if both sides are equal, or if one side is heavier than the other. 4) You may use the scale no more than three times. 5) You may write things on the coins with your marker, and this will not change their weight.