Question 1205955
n, d, p
nickels, dimes, pennies


{{{system(p/d=2,n+d+p=37,5n+10d+p=155)}}}


several ways to handle...


{{{system(p=2d,n+d+2d=37,5n+10d+2d=155)}}}


{{{system(n+3d=37,5n+12d=155)}}}


{{{highlight_green(5(37-3d)+12d=155)}}}

{{{5*37-15d+12d=155}}}

{{{-3d=155-5*37}}}

{{{d=(5*37-155)/3}}}

{{{highlight(d=10)}}}
Solve for the other two.