Question 1098683
n nickels
d dimes
q quarters


{{{system(n+d+q=57,d-q=8,n-d=5)}}}



{{{system(q=d-8,n=d+5)}}}------substitute these in the "57" coin sum.


{{{(d+5)+d+(d-8)=57}}}
Solve for d; and then evaluate the other two coins.