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y=ilosć solanki 2%
x+y=20kg
10%x+2%y=20×8%
x=20-y
0,1x+0,02y=1,6
0,1(20-y)+0,02y=1,6
2-0,1y+0,02y=1,6
-0,08y=1,6-2
--0,08y=-0,4
y=0,4:0,08
y=5
x=20-5=15
trzeba zmieszać 15kg 10% i 5 kg 2% solanki.