The age of the father 4 years ago was 8 times the age of his son. At present, the father's age is 4 times that of his son. Find the present age of son.
Amish Tripathi, a famous Indian writer, is working on a series based on Ramayana, in which the first two books focus on Rama and Sita, respectively. On which character does the third book of this series focus?