solutia1 : Vs1 = 200ml q1 = 1,1g/ml ⇒ ms1 = 220g c1 = 10% ⇒ md1 = 22g
solutia 2 : ms2 = 400g c2 = 20% ⇒ md2 = 80g
solutia 3 : ms3 = 100g md3 = 100g
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ms final = ms1 + ms2 + ms3 = 720g
md final = md1 + md2 + md3 = 202 g ⇒ c = 202·100/720 = 28%
Vs = ms/q = 720/1,2 = 600ml