Odpowiedzi

2010-02-11T20:19:30+01:00
X+y=90->x=90-y
x+10%x +(y-20%y)=90-3 -> x+0,1x+y-0,2y=87 -> 1,1x+0,8y=87
1,1*(90-y)+0,8y=87 -> 99-1,1y+0,8y=87 ->-0,3y=-12 ->y=40

x=90-40
x=50