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ilość solanki 2% - 20-x
10%*x+2%*(20-x) = 8%*20
0,1x+0,02(20-x) = 0,08*20
0,1x+0,4-0,02x = 1,6
0,08x = 1,6-0,4
0,08x = 1,2 |:0,08
x = 15
ilość solanki 10% - 15kg
ilość solanki 2% - 20kg-15kg = 5kg
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