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[30:(70+30)]*100%=0,3*100%=30%
700g- masa wody
30dag- masa soli kuchennej
30dag= 300g
700g+300g= 1000g
1000g- 100%
300g- x%
x= 300g * 100% /1000g = 30 %
Odp.; Procentowe steżenie tego roztworu wynosi 30 %