Question 878001
{{{F+T=39}}}
.
.
.
{{{5F+10T=325}}}
{{{F+2T=65}}}
Subtract eq. 1 from eq. 2,
{{{F+2T-F-T=65-39}}}
{{{T=26}}}
Then,
{{{F=39-26}}}
{{{F=13}}}
Thirteen $5 and twenty-six $10 bills.