That is a very simple mathematics question.
$ J- v H9 L- G; ?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。Let x = Male, y = Female, z = Child
* F- E* v1 U7 N. Y$ l8 \0 f* Ltvb now,tvbnow,bttvb6x + 3y + z/2 = 100 Formula 1
6 W8 P! `* M4 j# i _% ~1 w/ itvb now,tvbnow,bttvbx + y + z = 100 Formula 2
/ q' C6 E4 I( M) t# K2 OSimplify Formula 2 into z, we get z = 100 - x - y Formula 3
/ ]1 K; X3 l/ f* [% W; b; B+ F4 atvb 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。; \& [8 k( C' b; ]7 @' Z
Formula 4 can change into 11x + 5y = 100 Formula 5
- \% _0 L. H/ X公仔箱論壇In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.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。: U8 T+ E( z! i/ s6 F' `
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 = 80.5.39.217.775 M9 m: x8 Y8 i2 b& i1 r: _/ f
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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