Question 932829
q and d for how many quarters and how many dimes.



{{{system(q+d=39,0.25q+0.10d=6.80)}}}


{{{system(q+d=39,5q+2d=136)}}}


{{{system(2q+2d=78,5q+2d=136)}}}


{{{3q=136-78}}}


{{{3q=58}}}
{{{q=19&1/3}}}, nonwhole.  You are correct.