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枫下家园 / 望子成龙 / 放松一下,做一道智力题:
-baffin(~噗嗤~);
2009-3-17
{712}
(#5122079@0)
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the business man was assuming 1/a + 1/b = (1+1) / (a+b) which is not correct.
-wangqingshui(忘情水);
2009-3-17
(#5122127@0)
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I need sticks (ot oranges which are even better) to show the teacher the reason.Boy A has 30 oranges = 2 oranges/set * 15 sets. Boy B has 30 oranges = 3 oranges/set * 10 sets. Getting 10 sets from A and 10sets from B, these 2 * 10 + 3 * 10 = 50 oranges could be sold as 5 oranges for $2. A still had 5 sets (2 oranges each) and were actually sold $1 each set, that is $5. If we sold it as 5 oranges for $2, that could be sold for $4 only. That's why C got only $24. Hm, I could graduate from elementary school now.
-wangqingshui(忘情水);
2009-3-17
{436}
(#5122145@0)
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答得真快。祝贺你。做完下面这道题就可以中学毕业了: :)十二个外形一样的球, 其中十一个质量都相同, 只有一个与其他球的质量不同.问:给你一个天平,只称三次,如何找出这个与众不同的球?
-baffin(~噗嗤~);
2009-3-17
{124}
(#5122160@0)
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only guess. can not distinguish in three times if dont know ligher or heavier
-c1xwy(洪兴罩俺去战斗);
2009-3-17
(#5122287@0)
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Such information is not necessary.
-baffin(~噗嗤~);
2009-3-17
(#5122487@0)
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a1234=b1234 => c1=c2 => c3 > c4 this is the fast way, how could u tell c3 or c4 is the one?
-c1xwy(洪兴罩俺去战斗);
2009-3-17
(#5122495@0)
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This is fast way, but not the right way. Try it again.
-baffin(~噗嗤~);
2009-3-17
(#5122556@0)
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yes, last time should take a1 with c3
-c1xwy(洪兴罩俺去战斗);
2009-3-17
(#5122588@0)
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I do not know but searched an answer.
-wangqingshui(忘情水);
2009-3-18
{4285}
(#5125451@0)