[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塊磚公仔箱論壇9 ]! d7 }' a+ f1 }
規則1 H! \9 P7 i# C7 t/ @# Q( f
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 f* `" q7 d4 C0 j) u5 F: ?# k
1女人搬3塊磚tvb now,tvbnow,bttvb `- x4 u2 P% q# L. {
2個細路仔搬1塊磚
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問搬100塊磚
要幾多男人、女人同細路仔公仔箱論壇8 q5 d( R5 n3 L# {9 ?; a; x
www1.tvboxnow.com6 ]: R: m+ L# n+ W9 o. _( m
答案30號公佈
www1.tvboxnow.com# r. ^0 |' \% J6 ~
[ 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.
Let x = Male, y = Female, z = Child$ \. o4 v, P3 [: K3 d
6x + 3y + z/2 = 100 Formula 1
x + y + z = 100 Formula 2tvb now,tvbnow,bttvb% K F4 G# B# W/ g1 L- H0 Y
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3www1.tvboxnow.com& e& [) u8 J. i8 i5 b3 b# B! e: V+ I
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4+ }5 [7 b7 ^, h2 L
Formula 4 can change into 11x + 5y = 100 Formula 5公仔箱論壇, y$ u/ p& ?* |9 o7 `# x# 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