100g 30% ..................... 3-0 = 3
........................ 3%
xg 0% ...........................30-3=27
100/x = 3/27
3x = 100*27
3x = 2700
x = 900g wody
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100g 30% ..................... 3-0 = 3
........................ 3%
xg 0% ...........................30-3=27
100/x = 3/27
3x = 100*27
3x = 2700
x = 900g wody