Question 736645
d dimes
q quarters
{{{system(q=2d,and,0.25q+0.1d=1.80)}}}


Only one variable needed.
{{{0.25*2d+0.1d=1.80}}}
{{{0.5d+0.1d=1.8}}}
{{{0.6d=1.8}}}
{{{highlight(d=3)}}}-------three dimes