Question

o persoana cheltuieste o suma de bani in 3 zile,astfel:
in prima zi trei cincimi din suma si inca 20 de lei
a doua zi cheltuieste 20% din rest
iar a treia zi restul de 24 de lei
a)aflati ce suma a avut initial persoana

Answer 1

[tex]x=suma\ initiala\\ \frac{3}{5}x+20+\frac{20}{100}(x-\frac{3}{5}x-20)+24=x\\ \frac{3x}{5}+20+\frac{1}{5}(\frac{2x}{5}-20)+24=x\\ \frac{3x}{5}+20+\frac{2x}{25}-4+24=x\\ \frac{17x}{25}+40=x\\ 17x+1000=25x\\ 8x=1000=\ \textgreater \ x=125lei[/tex]