That is a very simple mathematics question.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。+ f) g- s, |6 t2 N7 |9 i" y
Let x = Male, y = Female, z = Child
b+ K a9 X, J' }. u4 V7 l( I! u6x + 3y + z/2 = 100 Formula 1www.tvboxnow.com- G* V7 J( D1 w$ ~5 {5 T; S5 O# A
x + y + z = 100 Formula 2$ @" V" {: P0 g
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3公仔箱論壇4 ^0 r7 ^, S: S7 k9 u6 a* J0 o9 k1 ?
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4
# {+ N6 H* m6 h8 k公仔箱論壇Formula 4 can change into 11x + 5y = 100 Formula 5
& X* S1 [! h+ j: E2 S- itvb now,tvbnow,bttvbIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.www.tvboxnow.com5 |! b. F" h) D4 K! O
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。# G$ `; _. j, b- z! g
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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