Question 304803
n=nickels, d=dimes, q=quarters


{{{n=d}}}, {{{d=q}}}, {{{n=q}}}
{{{0.05n+0.10d+0.25q=4}}} ----> {{{5n+10d+25q=400}}}


----> {{{5q+10q+25q=400}}}


{{{40q=400}}}


{{{q=10}}}


Answer: 10 nickels, dimes, and quarters