That is a very simple mathematics question.
' I9 Q6 @# N" {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 = Childtvb now,tvbnow,bttvb) ?$ Q- W7 \( q3 J' v
6x + 3y + z/2 = 100 Formula 1
& @+ N! ^: M, T7 N% N/ ^www2.tvboxnow.comx + y + z = 100 Formula 2- H5 W" r# I: |
Simplify Formula 2 into z, we get z = 100 - x - y Formula 3TVBNOW 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。6 k/ R8 k6 M; o
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4公仔箱論壇: ^: @, l: L+ }& r1 } O" K# R" Y! Q. z
Formula 4 can change into 11x + 5y = 100 Formula 5
( O3 Y1 }/ N5 A8 [/ r0 G& QIn Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.
2 q: b1 g9 p) M* U7 m2 UAnd 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.
2 u, F# z! ~/ L8 Y/ }+ _www2.tvboxnow.comEventually, the answer is 20 female and 80 children and no male. |