Question 956771
{{{N+D=36}}}
{{{5N+10D=225}}}
Multiply the first equation by 5 and subtract it from the second.
{{{5N+10D-5N-5D=225-180}}}
{{{5D=45}}}
{{{D=9}}}
So then,
{{{N+9=36}}}
{{{N=27}}}
27 nickels and 9 dimes