Zadanie 1 :
[tex]m_s=10 \ g\\\\m_r=250 \ g\\\\C_p=\frac{10g}{250g}\cdot100\%=\frac{1}{25}\cdot100\%=\boxed{4\%}[/tex]
Zadanie 2 :
[tex]m_s=15 \ g\\\\m_r=15 \ g+335 \ g=350 \ g\\\\C_p=\frac{15g}{350g}\cdot100\%\approx\boxed{4\%}[/tex]
Zadanie 3 :
[tex]15\%=0,15\\\\0,15\cdot300 \ g=\boxed{45 \ g \ soli}\\\\300 \ g-45 \ g=\boxed{255 \ g \ wody}[/tex]