Răspuns :
I zi: x/4 a cheltuit
x-x/4=3x/4 restul ramas
II zi: 1/3·3x/4+70=x/4+70 cheltuiti
3x/4-(x/4+70)=2x/4-70=x/2-70 ramas
III zi: x/2-70=180
x/2=180+70
x=250·2
x=500 lei
verificare:
Izi : 500/4=125 cheltuiti
500-125=375 ramas
II zi:375/3=125+75=195 cheltuiti
375-195=180 ramasi
III zi:180-180=0
x-x/4=3x/4 restul ramas
II zi: 1/3·3x/4+70=x/4+70 cheltuiti
3x/4-(x/4+70)=2x/4-70=x/2-70 ramas
III zi: x/2-70=180
x/2=180+70
x=250·2
x=500 lei
verificare:
Izi : 500/4=125 cheltuiti
500-125=375 ramas
II zi:375/3=125+75=195 cheltuiti
375-195=180 ramasi
III zi:180-180=0