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po zmieszaniu masa roztworu 120 + 80 = 200g
czyli p = 6/200 *100% = 3%
120g - 5%
(120g + 80g) - X
120 x 5 = 200 x X
600 = 200X
3 = X
odp: Stężenie procentowe otrzymanego roztworu to 3%