Question 883498
d,n,q; dimes, nickels, quarters.


0.1d+0.05n+0.25q=3.75;  d=n+6; q=n+3.


More than one way to solve.  First, simplify the money equation.
{{{2d+n+5q=75}}};
Next easiest is substitute for d and q in this equation, and first solve for n.