[tex]\displaystyle\\\overline{a,bc}=\frac{11}{4} \Longleftrightarrow \frac{\overline{abc}}{100}=\frac{11}{4} \Longleftrightarrow \frac{\overline{abc}}{100}=\frac{11\cdot25}{4\cdot25} \Longleftrightarrow \frac{\overline{abc}}{100}=\frac{275}{100} \implies \boxed{\overline{a,bc}=2,75}}.[/tex]
