15 kg cartofi+ 12 kg varza= 89
5 kg cartofi+ 7 kg varza= 29 | ×3
15 kg cartofi+ 21 kg varza= 87
15 kg cartofi+ 12 kg varza= 89
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9 kg varza= 18 lei
1 kg varza= 18 lei : 9 lei= 2 lei
5 kg cartofi+ 2×7=29
5 kg cartofi= 29-14
5 kg cartofi= 15
1 kg cartofi= 15 : 5
1 kg cartofi= 3 lei