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x-ilość solanki 10%
y-ilość solanki 4%
x+y=15
0,1x+0,04y=15×0,06 /×(-10)
x+y=15
-x-0,4y=-9
dodajemy stronami
0,6y=6 /÷0,6
y=10
x+10=15
x=15-10
x=5
odp: solanki 10%mamy 5 kg a solanki 4% mamy 10 kg