7 saci zahar............3 saci orez........1 561 lei
5 saci zahar............3 saci orez........1 283 lei
________________________________ ( - )
2 saci zahar.................//.......................278 lei
Aflam cat costa 1 sac zahar
278 : 2 = 139 lei
Aflam cat costa 7 saci zahar
139 × 7 = 973 lei
Aflam cat costa 1 sac orez
(1 561 - 973) : 3 = 588 : 3 = 196 lei