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30% x= 0,3x= masa soku w tym roztworze
x+20kg= masa nowego roztworu
0,3x= 20%
x+20kg= 100%
...............................
20(x+20)=100*0,3x
20x+400=30x
400=30x-20x
10x=400
x=400/10
x=40kg
masa całkowita to suma , czyli 40 kg +20 kg=60 kg