[IQ題] [數學題]100人搬100塊磚

，描述：問要幾多男人、女人同細路仔

100人搬100塊磚
規則公仔箱論壇2 i- L; R1 ]6 V
只何用100人搬100塊磚,不能多也不能小...TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。' o( }8 k4 @$ p3 i- E( _% u
100人當中有男人、女人同細路仔
1個男人搬6塊磚
1女人搬3塊磚1 d5 ~! Y5 u" G( t4 G
2個細路仔搬1塊磚
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問搬100塊磚
要幾多男人、女人同細路仔

答案30號公佈公仔箱論壇& Y7 [: h2 }6 W* s- s4 _0 L) f
* J5 R0 J. L3 v4 M; |. Q$ t
[ 本帖最後由 1/5 於 2007-10-13 05:10 PM 編輯 ]

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twinsdragon

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發表於 2007-10-13 05:40 PM | 只看該作者

That is a very simple mathematics question.- v) \1 m3 \! r
Let x = Male, y = Female, z = Childwww2.tvboxnow.com* w3 t* y$ _7 n1 ?, R
6x + 3y + z/2 = 100 Formula 1
x + y + z = 100 Formula 2
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3www2.tvboxnow.com8 m0 `( S% j3 d1 ?, _
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4
Formula 4 can change into 11x + 5y = 100 Formula 5公仔箱論壇1 p, W+ k9 A+ F% R" y. t
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.
And between 0 and 9, only 0 can give me a single number of y. So, x has to be 0 and y have to be 20. Then put x and y back to formula 1, we get z = 80.
Eventually, the answer is 20 female and 80 children and no male.

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alan1234