Question

O persoana cheltuieste o suma de bani in 3 zile astfel: in prima zi doua treimi +15 lei, a doua zi 2cincimi din rest iar a treia zi 27 de lei. Aflati suma de bani initiala.

Answer 1

x= suma de bani initiala

2x/3+15 cheltuieste in prima zi,

x-2x/3-15=x/3-15 suma ramasa dupa prima zi

2(x/3-15)/5=(2x/3-30)/5=2x/15-6 cheltuieste a doua zi

x=2x/3+15+2x/15-6+27 numitor comun 15

15x=10x+225+2x-90+405

3x=540

x=540/3=180 lei