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(30 - x) kg - solanki 3%
2% * 30 = 3%(30 - x)
0,02*30=0,03(30-x)
0,6=0,9-0,03x
0,03x=0,9-0,6
0,03x=0,3
x=10
Odp: Odparowano 10 kg wody .