Question

1) $\frac{1}{60} : (- \frac{1}{30} ) - ( - \frac{6}{10}$.?
Dupa ce a cheltuit 65 % din suma pe care o avea , un elev a ramas cu 175 lei . Suma pe care a avut-o elevul initial este ?
Va rog , ajutati-ma

Answer 1

$\frac{1}{60} :(- \frac{1}{30} )-(- \frac{6}{10} )=$

$=\frac{1}{60} x(- \frac{30}{1} )+ \frac{6}{10}=$

$= -\frac{1}{2} + \frac{6}{10}=$

$= -\frac{5}{10} + \frac{6}{10}=$

$=\frac{1}{10}$
______________________________________
Suma- Suma*65%=175
S-S*65/100=175
S*100/100-S*65/100=175
S*35/100=175
S*35=17500
S=17500:35
Suma =500