That is a very simple mathematics question.
6 V: \# D4 n: C% \Let x = Male, y = Female, z = Child
: L4 V- E- D: L6 k% K1 X+ k公仔箱論壇6x + 3y + z/2 = 100 Formula 1$ l" _- D" m- ]
x + y + z = 100 Formula 2
, k8 q2 u8 k' j j* J6 I+ Z e# g# qtvb now,tvbnow,bttvbSimplify Formula 2 into z, we get z = 100 - x - y Formula 3tvb now,tvbnow,bttvb% }) o3 z: u: ~% o& q
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4; E4 U0 G4 i. }% ~
Formula 4 can change into 11x + 5y = 100 Formula 5
) p ^2 Q# M1 i! L- WTVBNOW 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。In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.
$ O! x+ B+ I8 a8 U5.39.217.77And 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.
- |! [3 O+ t8 c" F' [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。Eventually, the answer is 20 female and 80 children and no male. |
發表於 2007-10-13 05:08 PM
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