[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2 D, T7 Q6 S0 \$ e8 z$ a
規則公仔箱論壇5 P% ]) Q4 o6 A& E# |
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tvb now,tvbnow,bttvb& \* [9 K- M& B0 Y) {/ B# |, s
1個男人搬6塊磚www2.tvboxnow.com2 v/ n5 ^3 z4 P4 c& b3 m. P  w  o
1女人搬3塊磚4 d7 q: O1 \( x  j4 z5 @
2個細路仔搬1塊磚
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問搬100塊磚tvb now,tvbnow,bttvb6 ^: c$ K8 J% l% {
要幾多男人、女人同細路仔

答案30號公佈
tvb now,tvbnow,bttvb  ]! _4 q; ^+ d9 Z
[ 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
6x + 3y + z/2 = 100 Formula 1公仔箱論壇" j9 Q7 c  k! C# G
x + y + z = 100 Formula 2www2.tvboxnow.com9 |# Q1 v/ K& N; O& s# ~" h) 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 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.$ z  ]' W" M8 P: p& q% Y( Y9 U
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 = 80.9 w  v# ?% `; z% h
Eventually, the answer is 20 female and 80 children and no male.

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alan1234