Question

Matei a cheltuit o suma de bani in trei zile. In prima zi a cheltuit $\frac{2}{5}$ din suma, in ziua urmatoare a cheltuit $\frac{5}{8}$ din rest, iar in ultima zi a cheltuit 135 lei. Aflati suma de bani cheltuita de Matei in cele trei zile.

Va rog ajutati!

Answer 1

1) 2x/5    ;         x-2x/5 =5x/5-2x/5 =3x/5     rest
2) 5/8 *3x/5 =5*3x/8*5 =15x/40 =3x/8
3) 135 lei

2x/5+3x/8 +135 =x      numitor  40
16x+15x+5400 =40x
40x-16x-15x =5400
9x =5400
x =600 lei