The ratio of the ages of husband, wife and their son is 10 : 9 : 3. In order to calculate the age of the son, which of the following piece of information would be additionally required which would also be sufficient
1
6 years ago, son's age was 20% of his mother's age at that time.
2
After 10 years, the sum of the ages of all three will be 30 more than the sum of their present ages.
3
Age difference between father and son is more than age difference between mother and son.
4
The sum of the ages of all three is a perfect multiple of 11.