Question 103199
x+y+z=15 number of bills
5x+10y+20z=185 amount in the drawer.
3 unknowns & only 2 equations needs a table
x=====y=====z====value
1=====1=====13===5+10+260=275 too much!
1=====2=====12===5+20+240=265 too much
1=====5=====9====5+50+180=235 too much
1=====10====4====5+100+80=185 looking good for an answer.
proof
1+10+4=15 bills.
1*5+10*10+4*20=5+100+80=185 value.