Răspunsuri

2014-08-29T00:06:12+03:00
X-nr bancnotelor de 1 leu
y-nr bancnotelor de 5 lei

x+y=20
x=20-y

x+5y= 64
20-y +5y=64

4y=64-20
4y=44
y=11 bancnote de 5 lei

20-11=9 bancnote de 1 leu
12 4 12