200kg grau.........160kg faina
x kg grau..............420kg faina
______________________d.p.
x=200·420/160=200·42/16=525kg (grau)
200kg grau.............160kg faina
3000kg grau...........y kg faina
_______________________d.p.
y=3000·160/200=30·160/2=15·160=
y=2400kg (faina)