[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
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。9 ?" o3 R9 K. G+ G$ v( e4 A$ S6 q* {
100人當中有男人、女人同細路仔
1個男人搬6塊磚8 I6 O( `( I- A- S) K* G n2 n" c
1女人搬3塊磚
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。1 j" c; d0 X# g. |
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答案30號公佈

[ 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! T4 b" [' X( a4 b4 L& ^0 X
Let x = Male, y = Female, z = Child H' _2 `) u ]& M" g) ^) K
6x + 3y + z/2 = 100 Formula 1
x + y + z = 100 Formula 2tvb now,tvbnow,bttvb# I2 J9 J y$ u3 X) `
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 47 ]3 B8 \) Y6 B! E' F3 b, G) G
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.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。2 Z- h- {# C: c0 q8 E! I
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.tvb now,tvbnow,bttvb7 ?- f8 G6 p( F
Eventually, the answer is 20 female and 80 children and no male.

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alan1234