Question 949159
{{{5N+10D=300}}}
{{{N=9+D}}}
Substituting,
{{{5N+10(9+D)=300}}}
{{{5N+90+10D=300}}}
{{{15D=210}}}
{{{D=14}}}
So then,
{{{N=14+9}}}
{{{N=23}}}
23 nickels and 19 dimes