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5 rigle 15 gume 450 lei 7 rigle 15 gume 510 lei​

Răspuns :

7rigle,,,,,,,,,,,,,,,15gume,,,,,,,,,510lei

5 rigle ,,,,,,,,,,,15 gume,,,,,,,,,,,450lei /(-)

2rigle ,,,,,,,,,0gume,,,,,,,,,,,60 lei

Rigla = 60÷2 = 30 lei /buc

Gume = (450-5×30)÷15= 300÷15= 20 lei/buc

Proba !

7x30+15x20= 210+300=510 lei