3 mingi + 4 masini = 146 lei
3 mingi + 7 masini = 224 lei
3 mingi =146 - 4 masini
3 mingi =224-7 masini
146- masini = 224- 7 masini
7 masini - 4 masini = 224-146
3 masini = 78
1 masina = 78 : 3 = 26
3 mingi=146 - 4 × 26
3 mingi = 146-104
3 mingi= 42
o minge = 42: 3 = 14
R:o masina costa 26 lei isr o minge 14 lei
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