twinsdragon

That is a very simple mathematics question.公仔箱論壇  q6 T1 ~) |. {3 X( |
Let x = Male, y = Female, z = Child
0 Z) O9 j. O8 E$ h0 m+ S5 |$ K5.39.217.776x + 3y + z/2 = 100   Formula 1tvb now,tvbnow,bttvb) f9 K  Q, t- n4 t  v$ S% u8 G
x + y + z = 100    Formula 2
) T/ Y' c/ W0 [tvb now,tvbnow,bttvbSimplify Formula 2 into z, we get z = 100 - x - y Formula 3tvb now,tvbnow,bttvb) [2 R+ _5 Q- e" `
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4
4 S  ?; w4 q: J; j0 J8 Gtvb now,tvbnow,bttvbFormula 4 can change into 11x + 5y = 100 Formula 5TVBNOW 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。4 Y+ B3 y: E. l' [/ R% Z
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.
8 Q8 m+ r( Y; q3 R1 ]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。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。& o% x+ ~- g( q: L
Eventually, the answer is 20 female and 80 children and no male.