Question

raluca are  200 LEI ,in bacnote de 10 si 5 lei .Daca are in total 28 bacnote ,aflati cate bacnote de 5 lei are Raluca

Answer 1

x-nr bancnotelor de 5 lei
y-nr bancnotelor de 10 lei

x+y=28  |-5
5x+10y=200

-5x-5y=-140
5x+10y=200
/5y=60
y=12
x=16