赛利有12枚银币。其中有11枚真币和1枚假币。假币看起来和真币没有区别，但是重量不同。但赛利不知道假币比真币轻还是重。于是他向朋友借了一架天平。朋友希望赛利称三次就能找出假币并且确定假币是轻是重。例如:如果赛利用天平称两枚硬币，发现天平平衡，说明两枚都是真的。如果赛利用一枚真币与另一枚银币比较，发现它比真币轻或重，说明它是假币。经过精心安排每次的称量，赛利保证在称三次后确定假币。-Celli has 12 silver coins. Including 11 real and one counterfeit coin. Counterfeit currency and real currency looks no different, but the weight difference. However, Lee does not know race of counterfeit money or a lighter weight than the real coins. So he borrowed a balance to a friend. Lee said the three friends hope the event will be able to identify counterfeit money and counterfeit money is light is re-established. For example: If the game balance, said the use of two coins, found that a balance scale, indicating two are true. If the game using a real currency compared with another one silver and found that it is lighter than the real coins or heavy, that it is a counterfeit. Tailor-made for each of the weighing, Saily guarantee that after three to determine counterfeit money.