Răspuns:[tex]Elevi\ care\ au\ obtinut\ premiul\ I=\frac{5}{100}*600=30\ elevi\\Elevi\ care\ au\ obtinut\ premiul\ II=\frac{10}{100}*600=60\ elevi\\Elevi\ care\ au\ obtinut\ premiul\ III=\frac{15}{100}*600=90\ elevi\\Elevi\ care\ au\ obtinut\ premii\ speciale=\frac{20}{100}*600=120\ elevi,\ dintre\ care\ 30\ au\ premiul\ I\\\\Notam\ cu\ x\ procentul\ elevilor\ cu\ premiul\ I\ din\ elevii\ care\ au\ primit\ premii\ speciale => \frac{x}{100} *120=30 => \frac{12x}{10}=30 => x=\frac{300}{12}=25[/tex]