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y-ilość solanki 5%
0,02x+0,05y=0,03*6
x+y=6
0,02x+0,05y=0,18 /*100
x=6-y
2x+5y=18
x=6-y
2(6-y)+5y=18
x=6-y
12-2y+5y=18
x=6-y
3y=6
x=6-y
y=2
x=4
solanki 2% zużyto 4kg