Question 1011708
<pre>
How Many   These bills
x          P10
y          P20
z          P50</pre>


{{{system(x+y+z=2060,y=z+5,x=3z-4)}}}


How you handle the system is your choice, depending on other instructions about what you are studying.  Look for something obvious and maybe you will find it, like the last two equations are both 'variable' in terms of z.