100人搬100塊磚5.39.217.766 e% \$ \3 d; i% I4 e2 U1 j1 _8 m
規則 ) W( d- n. Q# ]3 u" Q公仔箱論壇只何用100人搬100塊磚,不能多也不能小...7 n3 s1 v- \0 N% f
100人當中有男人、女人同細路仔 1 p; ^& @( {6 K7 U' T- W% G; ^. E公仔箱論壇1個男人搬6塊磚tvb now,tvbnow,bttvb4 {8 f) z7 n% \5 O; S' _
1女人搬3塊磚 P2 E& t3 Z# Q3 ]3 s9 W2個細路仔搬1塊磚 - H4 t+ ]% [# S8 ^4 b' c**************************************************************" s2 N4 B7 _) B& k7 K0 \
問搬100塊磚tvb now,tvbnow,bttvb" `2 ]+ R e, L3 w
要幾多男人、女人同細路仔+ n2 n' ^: }! A2 b0 ^7 B
公仔箱論壇' ^. X5 C, i% c
答案30號公佈* K% D" a" N$ o. b5 x
tvb now,tvbnow,bttvb4 n. d5 B, n; E; V; X
[ 本帖最後由 1/5 於 2007-10-13 05:10 PM 編輯 ]作者: twinsdragon 時間: 2007-10-13 05:40 PM
That is a very simple mathematics question.公仔箱論壇+ E! }8 g O; \8 h2 ~7 Q3 B- W) u
Let x = Male, y = Female, z = Child* X; B1 h1 [% p0 ^8 @
6x + 3y + z/2 = 100 Formula 1: P. i8 w) x3 p
x + y + z = 100 Formula 2tvb now,tvbnow,bttvb: _6 s$ S e" C7 }" F: ]
Simplify Formula 2 into z, we get z = 100 - x - y Formula 35 x9 E/ R2 T |; F+ E; D0 {& q3 E
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 7 f2 ~# m6 r: e( tFormula 4 can change into 11x + 5y = 100 Formula 5. I0 Y U% ?0 _
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want. ; ]& c7 A. @( J, O* ~/ L/ @tvb now,tvbnow,bttvbAnd 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.: ` h. j/ P8 U9 q, i" }
Eventually, the answer is 20 female and 80 children and no male.作者: alan1234 時間: 2007-10-14 12:19 AM 標題: two answers
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