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650 g * 0.15 = 97.5 g
97.5 g - masa soli
650 - 97,5 = 552.5 - masa wody
2.
30 g - 18%
x g - 82 %
x= 136.7 g wody
3.
650 * 0.18 = 117 g
650 + 70 = 720 g
cp = ms/mr * 100%
cp= 117/720 * 100 = 16.25 %
18 - 16.25 = 1.75 %
stezenie zmienilo sie o 1.75 %