In AGE BASED QUESTIONS there is no hard rules or formulae.
*but there is step by step procedure for finding solutions of such kind of questions.
1- Read the questions carefully and observe the given conditions minutely as a slight wrong adjustments can make the computed answer wrong.
2(a)-then assume the ages of objects( father ,mother, or any person framed in questions in the terms of X and Y or any other alphabetical letter according to convenience.)
2(b)if the ratio is given then actual ages can be assumed in the terms of X or any letter.
3-follow the given conditions and form equations. after solving those equations one can compute the required values.
below two examples are given, which will make the process easy.
Q- 1)A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 27, the how old is B?
Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.
(2x + 2) + 2x + x = 27
5x = 25
x = 5.
Hence, B's age = 2x = 10 years.
A man is 24 years older than his son. In two years, his age will be twice the age of his son. The present age of his son is:
Let the son's present age be x years. Then, man's present age = (x + 24) years.
(x + 24) + 2 = 2(x + 2)
x + 26 = 2x + 4
x = 22 years