找假币：小明去买猪肉，结果找来的零钱中有假币（硬币）！可惜小明一不小心把它混进了一堆真币里面去了。现在知道假币的重量比真币的质量要轻。给你一个天平，请用最快的时间把那个可恶的假币找出来。-Looking for counterfeit money: Xiao Ming to buy pork, the results got from the small change in counterfeit money (coins)! Unfortunately, Bob accidentally got into it a bunch of real coins inside. Now know that the weight of counterfeit currency than real quality to light. Give you a balance, use the fastest time to find out that nasty counterfeit money.