notam cu X= carti romanesti
Y= carti straine
X-Y = X×2:3 |×3 =>3X-3Y=2X =>X= 3Y
(X+Y):8=125 | ×8
X+Y = 125×8
X+Y = 1 000
X _____ _____ _____
Y _____
avem 4 segmente egale
1 000 : 4 = 250 ( un segment)
X = 3×250 = 750 (carti romanesti)
Y = 250 (carti straine)
V. X+ Y = 750 + 250 = 1 000