Question

Dupa ce a cheltuit 65% din suma pe care o avea,un elev a ramas cu 175 lei. Aflati suma initiala.

Answer 1

x-65/100•x=175
65/100->65 supra 100
amplifici cu 100x-65x/100=175
100x-65x/100 =175
35x/100=175
35x=17500
x=17500/35
x=500
sper ca te.am ajutat :)

Answer 2

$\displaystyle n- \frac{65}{100} \cdot n=175 \\ \frac{100n}{100} - \frac{65n}{100} =175 \\ \frac{35n}{100} =175 \\ 35n=175 \cdot 100 \\ 35n=17500 \\ n= \frac{17500}{35} \\ n=500~lei$