[tex]Raspuns:\\
ms=500g\\
C=30\%\\
-------\\
md=?\\
ma=?\\
~-------\\
C= \frac{md}{ms} *100\\
\boxed{md= \frac{C*ms}{100}} \\
ms=md+ma\\
\boxed{ma=ms-md}\\\\
Inlocuim:\\
md= \frac{30*500}{100} \\
md= \frac{15000}{100} \\
\boxed{md=150g}
ma=500g-150g\\
\boxed{ma=350g}
[/tex]