Question 60942
{{{n=d+3}}}
{{{5n+10d=150}}}
{{{5(d+3)+10d=150}}}
{{{5d+15+10d=150}}}
{{{15d+15=150}}}
{{{15d=135}}}
{{{d=9}}}

Jess has 9 dimes and 3 more, or 12, nickels.

To verify, 9 dimes + 12 nickels = 90 cents + 60 cents = $1.50.