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m 30 x (30 -x)
% 2% 0% 3%
30% * 2% -x * 0% =3%(30-x)
0,6=0,9 -0,03x
0.03x=0.9 -0,6
-0,03=0.3 / ;0,03
x =10 kg
należy odlać 10 kg wody