注目の話題: 妻の過去について; 彼氏にカマかけたらクロ　別れるべきか; おばさんイジリされる職場

Science,English,and math 4th

No.375　21/04/21 16:25
燻し銀三 ( 60代 ♂ IJ7P0b ) あ+あ-

【Do you know an almighty pair of scales w】

《Look for a false coin!》

If leaning on the one side, taking the three coins form the leaning scale and put them on each of the scale again one by one. If being balanced, the rest one is the fake, and if being leaning on one side, the one on the leaning scale is the fake.

Then how about 20 coins? Even if the coin increases to 20, we can point out which coin is false as long as we used the pair of scales three times.

At the first time, we choose eighteen coins at random and put every nine coin on each of the scale. If being balanced, the rest...

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