Question 1111457
p, n, d
Pennies, nickels, dimes


System:   {{{system(p+n+d=40,d-p=5,d/n=2)}}}


Single equation in ONE variable:  {{{highlight_green((d-5)+d/2+d=40)}}}


{{{highlight_green(2d-10+d+2d=80)}}}
{{{5d=90}}}
{{{highlight_green(d=18)}}}----------use this to find n and p.