If $$a=1$$, $$b=2$$, and $$c=3$$, then $$\overline{abc}=123$$. Find the value of $$m$$ according to this rule.  $$\overline{m21}=8\times \overline{m9}+3m$$. 
Overseas Competition->Knowledge Point->Number Theory Modules->Place Value and Number Bases->Applying the Principle of Place Value
$$\begin{eqnarray}\overline{m21}\&=\&8\times \overline{m9}+3m\textbackslash\textbackslash{} 100m+21\&=\&80m+72+3m\textbackslash\textbackslash{} 17m\&=\&51\textbackslash\textbackslash{} m\&=\&3.\end{eqnarray}$$ 