That is a very simple mathematics question.5.39.217.765 e+ R$ @+ `# `$ U# H
Let x = Male, y = Female, z = Child# n& K% |. G% g0 }
6x + 3y + z/2 = 100 Formula 1) q4 O/ ~4 ]0 ?0 }: G; E2 C, {
x + y + z = 100 Formula 2tvb now,tvbnow,bttvb, }4 I! u+ e# P' N/ L
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3公仔箱論壇: K7 r0 n0 C8 V, u+ X# K- f H
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 2 x5 l! h& d% D+ H. FFormula 4 can change into 11x + 5y = 100 Formula 5, ~3 w$ v0 M+ C
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.. V; h" m2 s$ @9 o o$ i
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 h# |9 s: S+ a9 r9 FEventually, 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
man,female,children 6 \! A' f6 b3 d, C! }) ZTVBNOW 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。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 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。; ~: d) ?7 ~/ A. Z2 m W' f! z9 x
11x + 5y = 100 Formula 5
( @/ o: X4 W9 ^, D11X must be 0 or multiple of 52 V; d; J! G# X: U
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM