That is a very simple mathematics question.tvb now,tvbnow,bttvb Y' Y5 }* w- C! J6 Q. F9 K9 @
Let x = Male, y = Female, z = Child, q2 z+ C) ^& T0 q
6x + 3y + z/2 = 100 Formula 1 9 y& d J3 B; n: l- [x + y + z = 100 Formula 2TVBNOW 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。) H% p& x% O/ C+ k/ V8 F9 g
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3! d( F( a) _; {* U, r
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4公仔箱論壇! Q0 N6 j- S: q; K5 S0 K0 o0 H! i3 E
Formula 4 can change into 11x + 5y = 100 Formula 5* W. ^9 b; l4 n
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.# J7 ?0 o5 ~# j y" X8 B; g
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。/ q4 K3 p, o) I- q# _8 m% P- Q* Q
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 公仔箱論壇, }% F/ A, R, d( o1 a, z! P
11x + 5y = 100 Formula 5
5.39.217.76- D/ K8 N4 d k. ?, w
11X must be 0 or multiple of 5公仔箱論壇" P; I+ A" n* M6 r, a5 J
that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM
86 children 8 F% V: k& Z( `2 Y* I d. S5 male 0 \( Z( J; B- o& \" m" u- F5.39.217.769 female作者: dafunhei123 時間: 2007-10-15 10:39 PM