Questions: t1 yrs earlier, the age of the father was x times the age of his
son. t2 yrs hence, the age of the father becomes z times the age of his son.
What are the present ages of the son and the father?
Note : Do you get the similarities between the above two direct methods? They differ
only in sign in the numerator. When the question deals with „ago‟, a +ve sign exixts and
when it deals with „after‟, a –ve sign exists in the numerator.
Then what formula comes?
Present age =
After T yrs=
Then, Son‟s age =
And, Father‟s age =