That is a very simple mathematics question.tvb now,tvbnow,bttvb" R+ a4 x' y1 [- c+ S% v: _/ w
Let x = Male, y = Female, z = Childtvb now,tvbnow,bttvb/ t; Q5 i. l& V5 ]! m) W
6x + 3y + z/2 = 100 Formula 1TVBNOW 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。& l. }! n! {8 i9 D9 K
x + y + z = 100 Formula 2& O; c* h9 S! F1 i- f
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3
& @" l- ~: |2 ^, G: ^& C# @2 r' ]tvb now,tvbnow,bttvbSub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4TVBNOW 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。5 |# a+ `( y* R$ \1 H$ c
Formula 4 can change into 11x + 5y = 100 Formula 5
/ ?( s9 ~0 g" X1 W7 dIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.
) D3 d2 r! e# G/ A* z* fAnd 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 = 80.0 }$ _* m B; n* C7 J
Eventually, the answer is 20 female and 80 children and no male. |
發表於 2007-10-13 05:08 PM
| 
