25. The age of arvind�s father is 4 times his age. If 5 years ago, father�s age was 7 times of the age of his son at that time what is Arvind�s father�s present age?

26. The ratio between the ages of A and B at present is 2:3. Five years hence the ratio of their ages will be 3:4 What is the preset age of A?

27. After five years the age of a father will be thrice the age of his son, whereas five years ago he was seven times as old as his son was. What is father�s present age?