\[\boxed{\mathbf{325}\mathbf{.}}\]
\[1)\ \frac{8}{12} = \frac{2}{3}\]
\[2)\ \frac{16}{28} = \frac{4}{7}\]
\[3)\ \frac{25}{60} = \frac{5}{12}\]
\[4)\ \frac{42}{48} = \frac{7}{8}\]
\[5)\ \frac{20}{36} = \frac{5}{9}\]
\[6)\ \frac{34}{54} = \frac{17}{27}\]