oblicz stężenie procentowe roztworu otrzymanego po zmieszaniu 20g 20-procentowego roztworu pewnej soli z 20g 5-procentowego roztworu tej soli
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20g 20% ...................... x-5
.................... x%
20g 5% .......................20-x
20(20-x) = 20(x-5)
400-20x = 20x-100
500 = 40x
x = 12,5%