Question 1066459
{{{n+q=20}}}
{{{q=20-n}}}



{{{0.05n+0.25q=4.40}}}
{{{n+5q=88}}}
substitute.
{{{n+5(20-n)=88}}}
{{{n+100-5n=88}}}
{{{-4n=88-100}}}
{{{4n=12}}}
{{{highlight(n=3)}}}-------Alvin has three nickels.