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Răspuns
9s+10m=720 lei
6s+5m=405 lei /x2
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9s+10m=720 lei
12s+10m=810
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3s =90
s=30lei un scaun
9x30+10m=720
270+10m=720
10m=720-270
10m=450
m=45 lei o masa
2 scaune+o masa=2x30+45=60+45=105 lei
9s+10m=720
6s+5m=405 |(-2)=>-12s-10m=-810
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-3s=-90=>s=30 lei
9*30+10m=720<=>10m=450=>m=45 lei
2s+m=2*30+45=60+45=105 lei