Răspuns:
21s faina..........12s cartofi.......1410 kg
17 s faina.........12s cartofi........1210 kg
----------------------------------------------------------
4f / 200kg
f=200:4=>f=50 kg are un sac de faina
21·50+12c=1410
1050+12c=1410
12c=1410-1050
c=360:12=>c=30 kg un sac de cartofi
