SOLUTION:

Since,

\[\begin{array}{*{35}{l}}

3\left( m\text{ }+\text{ }n \right)\text{ }=\text{ }2\left( m\text{ }+\text{ }3n \right)  \\

3m\text{ }+\text{ }3n\text{ }=\text{ }2m\text{ }+\text{ }6n  \\

m\text{ }=\text{ }3n  \\

m/n\text{ }=\text{ }3/1  \\

\end{array}\]