That is a very simple mathematics question.7 O3 d+ b' H6 P
Let x = Male, y = Female, z = ChildTVBNOW 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。9 b- B- D- p6 }4 e; ?& n
6x + 3y + z/2 = 100 Formula 1
d, D$ A3 `: h3 R" qwww2.tvboxnow.comx + y + z = 100 Formula 2
) ~5 Z+ q6 Z- g; z. Y% X8 C0 ]( FSimplify Formula 2 into z, we get z = 100 - x - y Formula 3/ m, Z5 d8 m. p3 e. a
Sub Formula 3 into Formula 1, we get 6x + 3y + ( 100 - x - y )/2 = 100 Formula 4
& @' U P5 B H9 S; i! I5 cwww2.tvboxnow.comFormula 4 can change into 11x + 5y = 100 Formula 5www2.tvboxnow.com" }, `' e Q3 U" O7 n2 V$ ]) C6 i
In Formula 5, x can only be 0 - 9, otherwise y will be negative number which we dont want.
& k$ X2 o& U. ^* l公仔箱論壇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.
; e4 m/ W! h _: mEventually, the answer is 20 female and 80 children and no male. |