That is a very simple mathematics question.公仔箱論壇; g" ^4 X$ U; V- Y
Let x = Male, y = Female, z = Child , ^. Z% a4 u- Y8 `公仔箱論壇6x + 3y + z/2 = 100 Formula 1 3 P8 y: g$ j. o L3 c- Jx + y + z = 100 Formula 21 j) w. @8 A4 n6 t
Simplify Formula 2 into z, we get z = 100 - x - y Formula 35.39.217.76/ n1 N% e/ S) I) f
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4公仔箱論壇1 n6 b' j3 `. z( K9 l
Formula 4 can change into 11x + 5y = 100 Formula 55.39.217.76+ D0 O9 G1 ? M/ d% D
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want. 3 F8 E% T8 T. ?* x. d vtvb 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. . N* l- w8 x% P) ~7 }5 I公仔箱論壇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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0,20,80 or 5,9,86作者: RyanC 時間: 2007-10-14 10:46 PM
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11X must be 0 or multiple of 5公仔箱論壇& H/ k# B1 J+ Z/ }" O" {
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 childrentvb now,tvbnow,bttvb$ K1 t1 E4 C. p- u, o u* `
5 male 公仔箱論壇( G* V& f# G/ o1 D) t. K# R6 d
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM
