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In 400 grame solutie se gasesc 80 grame zahar. Ce concentratie procentuala are solutia ?

Răspuns :

ms=400 g
md=80 g
[tex]c = \frac{md \times 100}{ms} = \frac{80 \times 100}{400} = \frac{8000}{400} = 20\%[/tex]