In depozit este o cantitate x de cereale.
In prima saptamana se scot 0.2x si mai raman 0.8x
In a doua saptamana se scot [tex] \frac{75}{100} 0.8x= \frac{3}{4} \frac{8}{10} x=3 \frac{2}{10}x =3 \frac{1}{5} x=\frac{3}{5}x[/tex]
[tex]0.2x+\frac{3}{5}x+160=x[/tex]
[tex]\frac{2}{10}x+\frac{3}{5}x[/tex]+160=x
[tex]\frac{1}{5}x+\frac{3}{5}x[/tex]+160=x
[tex]\frac{4}{5}x[/tex]+160=x
Deci 160=[tex]\frac{x}{5}[/tex]
x=800