Three friends $\mathrm{Amir}$, $\mathrm{Umar}$ and $\mathrm{Xavier}$ picked $\mathrm{pear}$ from the garden. $\mathrm{Umar}$ picked $\mathrm{4}\mathrm{boxes}$, $\mathrm{Xavier}$ picked $\mathrm{17}\mathrm{boxes}$ of $\mathrm{pear}$. If the total number of boxes picked by $\mathrm{Amir}$ and $\mathrm{Umar}$ is divided by the total number of boxes picked by $\mathrm{Xavier}$, it equals $\frac{24}{51}$. Find the total number of boxes picked by $\mathrm{Amir}$.

$\mathrm{Amir}$ picked a total of