Present age of Rajeev is 100/3% of his fathers age and his father is half of the age of grandfather of Rajeev. The average of the present ages of all of them is 110/3 years. What was the ratio of their ages 10 years ago?
A)1 : 43 : 56 B)1 : 23 : 56 C)1 : 23 : 46 D)5 : 27 : 16 E)None of these