Question 930430
Silver dollar would seem to be 1$ each.


q for quarters, and s for SILVER dollars;
{{{system(q=s,0.25q+s=50)}}}


{{{system(q=s,q+4s=200)}}}


Either substitution,
{{{q+4q=200}}}
{{{5q=200}}}
{{{q=40}}}, indicated by q=s, {{{s=40}}}.


Total coins,  {{{q+s=40+40=highlight(80)}}}.