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Cel mai inteligent răspuns!
2014-04-27T23:16:13+03:00

fie x suma initiala, vom scrie in functie de x cat a cheltuit zilnic:

I) 2/3x+15

II) 2/5[x-(2/3x+15)]=...=2/15x-6

III) restul de 27 lei

Putem scrie ecuatia:

x-(2/3x+15)-(2/15x-6)=27 => x-2/3x-2/15x -15+6=27=>....

3/15x=36 => x=36x15/3=180 lei

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