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y - solanka 5%
x+y= 12 y=12-x
0.02x + 0.05 y = 0.02 * 12
0.02x+ 0.05 y = 0.24 / * 100
2x + 5y = 24
2x + 60 - 5x = 24
-3x= -36
x= 12
y = 0
p.s to nie jest zadanie z książki nie?? ;-)