[tex]\begin{gathered} h+v=679\Rightarrow(1) \\ 4h=3v \\ h=\frac{3v}{4}\Rightarrow(2) \\ \text{Now, from equation (1) and (2).} \\ \frac{3v}{4}+v=679 \\ \frac{3v+4v}{4}=679 \\ 7v=679\times4 \\ v=388 \\ \text{Thus, the virtual students is 388.} \end{gathered}[/tex]
