257 saci grau---312 saci porumb----22650 kg
349 saci grau----312 saci porumb----26514 kg |(-)
349-257----------/------26514-22650
92-----/---3864
92 saci grau=3864
saci grau =3864-92=42 kg(un sac grau)
312 saci porumb=22650-257×42=22650-10794=
=11856
saci porumb =11856:312=38 kg (un sac porumb)