That is a very simple mathematics question.5.39.217.77/ m3 D- c7 I4 U
Let x = Male, y = Female, z = Child 2 q3 s( R5 b' `5.39.217.776x + 3y + z/2 = 100 Formula 1 : b2 x5 l/ f; P5 N! A公仔箱論壇x + y + z = 100 Formula 2tvb now,tvbnow,bttvb; l; H- ~9 j# P5 S+ D0 i; q, F
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3公仔箱論壇+ M4 Q2 F- ~" l+ i
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 3 l. r. ^! \+ h公仔箱論壇Formula 4 can change into 11x + 5y = 100 Formula 5 # u+ O; j. A; Z0 ttvb now,tvbnow,bttvbIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.7 k2 v- M! W# v) g' D
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.& _$ y! Y7 Z) C
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
原帖由 twinsdragon 於 2007-10-13 05:40 PM 發表 9 V- D! |% W- `; [# u l G
11x + 5y = 100 Formula 5
( e9 | ]8 Z0 V% D11X must be 0 or multiple of 5 . Y! p. T: g: b( P3 wTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children & |6 B& L# i! @: e: a公仔箱論壇5 male - L ]: ]' A9 P公仔箱論壇9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM
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