Question 314522
N-number of nickels
D-number of dimes
Q-number of quarters
.
.
.
{{{Q=2D}}}
{{{D=Q/2}}}
.
.
{{{Q=3N}}}
{{{N=Q/3}}}
.
.
{{{5N+10D+25Q=190}}}
{{{5(Q/3)+10(Q/2)+25Q=190}}}
{{{5(Q/3)+30Q=190}}}
{{{5Q+90Q=570}}}
{{{95Q=570}}}
{{{highlight(Q=6)}}}
She has 6 quarters.