Amita has 12 marbles and Reeta has 8 marbles. Geeta says that she has 2 times the marbles that Reeta has.
Then ratio of marbles of - Amita : Reeta : Geeta is
3 : 2 : 4
Reeta has 8 marbles.
⇒ Geeta has 8×2 = 16 marbles
∴ Ratio of marbles of Amita : Reeta : Geeta = 12 : 8 : 16 or 3 : 2 : 4