[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5.39.217.76" p* [8 A- k1 j: d' u4 j
只何用100人搬100塊磚,不能多也不能小...
100人當中有男人、女人同細路仔
1個男人搬6塊磚公仔箱論壇7 P6 H0 N# h6 e& l8 c/ h+ Q1 g; a; N
1女人搬3塊磚
2個細路仔搬1塊磚公仔箱論壇- A  L+ h$ Z- W) Q; E4 y. J
**************************************************************, L. l  ^+ @% L
問搬100塊磚
要幾多男人、女人同細路仔tvb now,tvbnow,bttvb& e. \" [  {/ B0 ~6 F6 `$ R" d  D1 j

答案30號公佈5.39.217.76# F5 p0 W- k/ D6 s( P" \
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 z2 P' |: h6 E" j7 I* ?
[ 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.tvb now,tvbnow,bttvb3 m- \( E/ j; }+ ]
Let x = Male, y = Female, z = Child公仔箱論壇4 `6 `6 Z" v5 C1 z+ N
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 3
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4公仔箱論壇! N; ~. P1 @* X8 t
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.: N. _' S# v' Q) ^) L
Eventually, the answer is 20 female and 80 children and no male.

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alan1234