That is a very simple mathematics question.5.39.217.763 F% P/ K# c) ?! ~, S6 X
Let x = Male, y = Female, z = Child / v* e* l7 d( ?, w公仔箱論壇6x + 3y + z/2 = 100 Formula 1& e3 O6 l* i0 F+ c1 H; v1 _) w! ~( j6 ?
x + y + z = 100 Formula 2- |- c% i+ f8 r0 o7 h# Y
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3 & l9 @; v2 R; M; CTVBNOW 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。Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4 - `0 e& L& a7 N3 `0 H% j6 K4 z5 n公仔箱論壇Formula 4 can change into 11x + 5y = 100 Formula 54 I8 v0 i d5 |% [+ p; c
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.tvb now,tvbnow,bttvb3 i4 Q7 j1 H2 a9 w% T
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 = 80.5.39.217.76& i8 `, y2 ]9 Y# Q' I3 U5 F, A
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 - L8 X- Q+ J3 l
11x + 5y = 100 Formula 5
2 a) X6 ?9 z" W# f' i$ H& \11X must be 0 or multiple of 5 ! B1 r9 _/ p8 f/ S, H5 D' K, L+ Q5.39.217.76that meanz x must be 0 or 5作者: manstein 時間: 2007-10-15 08:28 PM