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x+12=y
0,06x+0,02*12=0,03y
0,06x+0,24=0,03y/*100
6x+2,4=3y
x+12=y
2,4=3y-6x
12=y-x
3y-6x=2,4
y-x=12/*(-3)
3y-6x=2.4
-3y+3x=-36
-3x=-33,6/(-3)
x=11,2
odp nalezy wlac 11.2 kg solanki sześcioproxcentowej.