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0,3x = 0,2(x + 20)
0,3x = 0,2x + 4
0,1x = 4
x = 40
40 + 20 = 60
Spr.
30% * 40 kg = 20% * 60 kg
12 kg = 12 kg
L = P
Odp. Całkowita masa otrzymanego roztworu wynosi 60 kg