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Vw=500cm³
cp=35%
ms=?
mw=dw*Vw=1g/cm³*500cm³=500g
cp=ms*100%/mr
cp=ms*100/(mw+ms)
cp*(mw+ms)=100*ms
cp*mw+cp*ms=100*ms
cp*ms-100*ms=-cp*mw
ms*(cp-100)=-cp*mw
ms=-cp*mw/(cp-100)
ms=-35*500/(35-100)
ms=-17500/(-65)
ms=269g