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y=ilosc solanki 2%
x+y=20
0,1x+0,02y=20*0,08 /*100
x=20-y
10x+2y=160
x=20-y
10(20-y)+2y=160
x=20-y
200-10y+2y=160
x=20-y
-8y=-40 /:(-8)
x=20-y
y=5
x=20-5
y=5
x=15
y=5
odp. Należy zmieszac 15 kg solanki 10% i 5 kg solanki 2%.