[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tvb now,tvbnow,bttvb9 f, T$ y% \7 q; U% C
規則
只何用100人搬100塊磚,不能多也不能小...tvb now,tvbnow,bttvb1 o( J) U7 v) c+ E
100人當中有男人、女人同細路仔) X6 ~% g5 F; w$ p4 t* Z2 U
1個男人搬6塊磚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。9 t1 N' s5 q- S# J I2 J- p) F
1女人搬3塊磚
2個細路仔搬1塊磚tvb now,tvbnow,bttvb _' F' i e$ d3 G# I2 q
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問搬100塊磚( B: T( M) T- o8 Z5 z! I1 h
要幾多男人、女人同細路仔
tvb now,tvbnow,bttvb2 A/ y& j* c7 m% Q6 @: @1 P6 a9 u( G
答案30號公佈公仔箱論壇1 ?4 p* J% P0 I1 M$ I4 d8 A
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。) E2 i2 P5 Z6 c# o
[ 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.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。: L8 A% b- v7 k6 I5 U
Let x = Male, y = Female, z = Child
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 39 B+ O& |0 c8 S0 c' f; z2 }+ u
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4. W+ r& E% v! {7 f0 K" Y% s% V
Formula 4 can change into 11x + 5y = 100 Formula 5
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.$ ?# l, p7 p1 Y
Eventually, the answer is 20 female and 80 children and no male.

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alan1234