Question

Mama are o suma de bani.Dupa ce dubleaza aceasta suma,cheltuieste 5 lei.Dubleaza apoi suma ramasa si mai cheltuieste 4 lei.Din noul rest cheltuieste inca o patrime si inca 6 lei.Ea constata ca iau mai ramas 96 de lei.Cati lei a avut mama

Answer 1

[(2a-5)x2-4]:4-6=96
[(2a-5)x2-4]:4=96+6
(4a-10)-4=102x4
4a-10=408+4
4a=412+10
a=422:4
a=105,50 lei