[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
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只何用100人搬100塊磚,不能多也不能小...tvb now,tvbnow,bttvb! w; w; J: ~& r2 `) d. V! l9 i+ x
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 E! G( A5 f* O# I4 t% D8 L
1女人搬3塊磚os.tvboxnow.com# T( E9 Z/ r* n1 h2 o
2個細路仔搬1塊磚
**************************************************************公仔箱論壇5 K0 K1 y6 o* v) s7 |
問搬100塊磚
要幾多男人、女人同細路仔

答案30號公佈tvb now,tvbnow,bttvb, J- j1 d! U' K% J1 ]* |
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[ 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 {, M2 F! O9 T' m/ m* [$ h( B D& V
Let x = Male, y = Female, z = Child
6x + 3y + z/2 = 100 Formula 1tvb now,tvbnow,bttvb0 p5 u3 J a5 L" b, H( ?
x + y + z = 100 Formula 2os.tvboxnow.com' a# C9 b& n+ s1 K
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3os.tvboxnow.com2 s" m/ l' ^3 O, \' E( q" L; E
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
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.! Z% r' H- k. v* b, q
Eventually, the answer is 20 female and 80 children and no male.

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alan1234