That is a very simple mathematics question.
% u9 K( E3 ?# ]Let x = Male, y = Female, z = Child
- m. s! R* m! E0 HTVBNOW 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。6x + 3y + z/2 = 100 Formula 1www.tvboxnow.com" M+ o" a: w2 i$ r9 _6 h% e9 U/ @
x + y + z = 100 Formula 2
" y; c) Q4 x3 t3 p0 b7 XSimplify Formula 2 into z, we get z = 100 - x - y Formula 3tvb now,tvbnow,bttvb) ]& T- V# Q% a& Z+ n8 s& n7 y
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4$ i& }4 s% g( k0 D2 C7 u
Formula 4 can change into 11x + 5y = 100 Formula 5www.tvboxnow.com* s/ q3 r; P' E8 t S: f
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.www.tvboxnow.com$ N! r! P2 P! I( C8 \
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.www.tvboxnow.com. ` V$ t C1 G" A5 x- U2 O
Eventually, the answer is 20 female and 80 children and no male. |