That is a very simple mathematics question.: n% H4 Z. x7 l" q5 r
Let x = Male, y = Female, z = Child
- _4 N# A: d# d4 L6 g6x + 3y + z/2 = 100 Formula 1公仔箱論壇6 [4 v8 O0 H+ F/ I1 l# _
x + y + z = 100 Formula 2
9 L% }/ L, ]) ]% r) O/ BTVBNOW 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。Simplify Formula 2 into z, we get z = 100 - x - y Formula 35 F& J" W8 C" j2 D Q/ d
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4tvb now,tvbnow,bttvb3 J$ E; E1 `3 P
Formula 4 can change into 11x + 5y = 100 Formula 5
! h# G" _, X+ H/ m. J' R+ M% G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。8 N% Q1 e8 ~4 z$ L p! x M
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.
. b8 Y( @! x& d& [& O% H公仔箱論壇Eventually, the answer is 20 female and 80 children and no male. |