That is a very simple mathematics question. 2 ]/ y! u7 o4 d# x! T. F- H5 b4 ktvb now,tvbnow,bttvbLet x = Male, y = Female, z = Child . T# ^# [+ x2 Q$ z3 l+ }) x9 Wtvb now,tvbnow,bttvb6x + 3y + z/2 = 100 Formula 1 ! A0 W/ h4 r! Z+ e/ jx + y + z = 100 Formula 25.39.217.77; ?. A& |2 j7 C/ _
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3 & e0 {5 t: F# |+ ]Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 0 u6 V6 W* ~# U! z2 i, z& |7 ~, f5.39.217.77Formula 4 can change into 11x + 5y = 100 Formula 5tvb now,tvbnow,bttvb, E+ j4 W8 U9 L; G8 |; `
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.tvb now,tvbnow,bttvb- n2 F2 ]& s" n0 V
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.TVBNOW 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。# n/ g% X9 R- _/ y# \* 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
原帖由 twinsdragon 於 2007-10-13 05:40 PM 發表 # J7 k. ^: E# K) g
11x + 5y = 100 Formula 5
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11X must be 0 or multiple of 5公仔箱論壇/ q8 {; h7 \2 }# l6 }/ Z/ z6 R4 L
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children $ h ~& N* E/ H+ K5 male tvb now,tvbnow,bttvb( L8 t* I) V* m2 Q% Y
9 female作者: dafunhei123 時間: 2007-10-15 10:39 PM
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