Question 1054604
Incomplete.  Just quarters or quarters and which other kinds, and how are the counts related if known?  Half-dollar pieces or no?  If not, then possibly


{{{system(0.01p+0.05n+0.1d+0.25q=12.6,p+n+d+q=108)}}}



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LATER INFORMATION:  Nickels and Quarters.


This makes for a system,  {{{system(0.5n+0.25q=12.6,n+q=108)}}}.

Multiply the money equation by 20:
{{{system(n+5q=252,n+q=108)}}}
Easy to start with Elimination....
{{{4q=144}}}
{{{highlight(q=36)}}}
and you already finished this.