[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0 V/ t8 w- z( O' x
規則( l' g* N( [/ a/ o0 K2 E' n
只何用100人搬100塊磚,不能多也不能小..." m3 E" c1 M8 ^
100人當中有男人、女人同細路仔
1個男人搬6塊磚
1女人搬3塊磚5.39.217.76$ v5 d" O9 F+ m& G
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
3 p# i/ E& t, F
答案30號公佈5.39.217.76' l9 g0 g- z4 t8 T. u+ a1 G2 {
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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.
Let x = Male, y = Female, z = Child公仔箱論壇7 j. `: o+ B; ?
6x + 3y + z/2 = 100 Formula 1# \5 w: q* @& ~) U# [. w/ |+ P# D
x + y + z = 100 Formula 2
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3公仔箱論壇4 a" d0 ]5 M, Y- j
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4( { C- |( S/ V3 `1 x
Formula 4 can change into 11x + 5y = 100 Formula 5公仔箱論壇 t% o1 _4 f+ S8 F# N
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