Question 599748
Your equation is wrong.  Try setting up a system
of two equations in n and d using this pattern:

{{{system(

(matrix(3,1,
number, of, nickels))+

(matrix(3,1,
number, of, dimes))=

(matrix(3,1,
number, of, coins)),




(matrix(6,1,
"$.05", times, the, number, of, nickels))+

(matrix(6,1,
"$.10", times, the, number, of, dimes))=

(matrix(4,1,
total, amount, of, money)))  }}}

Answer: 18 nickels, 12 dimes. 

Edwin</pre>