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y - solanka 10%
x+y=15
4%x+10%y=6%*15
x=15-y
0,04x+0,1y=0,06*15
0,04(15-y)+0,1y=0,9
0,6-0,04y+0,1y=0,9
0,06y=0,3
y=5
x=15-5
x=10
odp: Solanki 4% trzeba wziąć 10kg a solanki 10% 5kg.