来个小小的难题。难度: * * * (最难是5星）
这里有12个布袋，装了数量不一的金币。有其中一袋是假金币。真金币每棵重10克，而假金币每棵则重9克。怎样在只需秤一次的情形下，认定那一袋是装着假金币？
How to Solve?
There are 12 bags filled with unequal quantity of gold coins. However, among the 12, 1 of the bag contains fake gold coin. The mass of each of the real gold coin and fake gold coin is 10 gram and 9 gram respectively. How to determine which bag contains fake gold coin by just using the weight once?
5 comments:
Arrange the bags according to their number of coins, in ascending order, label them if you want from 1-12
Take 1,2,3...coin from the 12 bags respectively, there will be 1+2+3+4+5+6+7+8+9+10+11+12=78 coins
Weight those coins that are taken out
Deduct the weight taken from 780 (78*10)the remainder will indicate which bag contains of fake coins :)
Correct! :)
只要有看过金田一漫画的都会，其中一个故事有讲到这个……
看来你也是金田一读者。。。
哈哈。。。我也看过，
还想抢答，可是太迟了。。。
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