Question

Un elev are o suma de bani.dupa ce dubleaza aceasta suma cheltuieste 125000.dubleaza apoi suma ramasa si mai cheltuieste 200 000 lei.dupa ce dubleaza noul rest si mai cheltuieste 250000 lei constata ca l.au mai ramas 50000.care este suma initiala pe care a avut.o elevul

Answer 1

a+2a-125000=x
2x-200000=y
y-250000=50000
y=50000+250000
y=300000 lei
2x-200000=y
2x-200000=300000
2x=300000+200000
2x=500000
x=500000:2
x=250000 lei
3a-125000=x
3a-125000=250000
3a=250000+125000
3a=375000
a=375000:3
a=125000 lei
Suma intiala =125000ei
Proba
125000+2x125000-125000=x
125000+250000-125000=250000
375000-125000=250000(valoarea lui x)
2x-200000=y
2x250000-200000=300000
500000-200000=300000(valoarea lui y)
y-250000=50000
300000-250000=50000