Odpowiedzi

2010-02-08T21:47:26+01:00
X - cukier
y - mąka
200x + 150y = 900/ : 10
200 * 25%x+ 150 *20%y = 210
20x + 15y = 90
50x + 30y = 210 / : 10
20x + 15y = 90
5x + 3y = 21 / *(-4)
20x + 15y = 90
-20x-12y = -84
3y = 6
y = 2


200x + 150y = 900
200x + 150 * 2 = 900
200x = 600
x = 3