Odpowiedzi

2009-04-26T15:55:53+02:00
X+y=600
1,3x+0,7y=480

x=600-y
1,3*(600-y)+0,7y=480

x=600-y
780-1,3y+0,7y=480

x=600-y
300=0,6y

x=600-y
y=500

x=100
y=500