Question 1074658
q quarters
d dimes


The description literally gives  {{{system(q-d=8,0.25q+0.1d=6.2)}}}


Simplifying that system:  {{{system(5q+2d=124,q-d=8)}}}




The q-d=8 is the same as {{{2q-2d=16}}};


{{{(5q+2d)+(2q-2d)=124+16}}}

{{{highlight_green(q=20)}}}




You find d for dimes quantity.