Question 932080
F-number of 500 bills
T-number of 1000 bills
.
.
{{{F+T=26}}}
.
.
{{{500F+1000T=16500}}}
{{{F+2T=33}}}
Subtract the first equation from the second.
{{{F+2T-F-T=33-26}}}
{{{T=7}}}
Then,
{{{F+7=26}}}
{{{F=19}}}