The ratio of the present age of mother and her son is 8 ∶ 3. After 10 years the ratio of their ages become 2 ∶ 1, then what is the present age of son?
1
20 years
2
15 years
3
25 years
4
30 years
The ratio of the present age of mother and her son is 8 ∶ 3. After 10 years the ratio of their ages become 2 ∶ 1, then what is the present age of son?