Question

Daca numerele naturale a,b,c indeplinesc simultan conditiile:
   a+b+c=972,
   a+b =c,
    a:2=b,atunci b+c este:
  a.648,  b.486  c.162   d.324.

Answer 1

a+b+c=972,si a+b =c⇒c+c=972⇒2c=972⇒c=972:2⇒c=486

a:2=b⇒a=2b si c=486
a+b+c=972,⇒2b+b+486=972⇒3b=972-486⇒3b=486⇒b=486:3⇒b=162

b+c=162+486=648