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x-12%
Z proporcji: 12x450 przez 100.
12 x 450 5400
_______ = ______ = 54g
100 100
odp: Masa soli w tym roztworze wynosi 54g
x gram to 12%
x=450*12/100=54 gram
masa soli w roztworze jest rowna 54 gramy