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4%---100
4%x=100*6
4%x=600:4
x=150
należy dosypać 150g soli
x-6 dosypana sol
0,96*x=6
x=6,25
6,25-6= 0,25 kg
6kg - 100%
6kg + x - 104%
x - 4%
x=0,24 kg