The age of father is three times of his son. Six years ago the age of son was 1/6 times of his father. At the time of marriage his mother was 5 years younger to his father. Find the present age of mother.

25 years

 Let present age of son = x 

Then according to question age of father is 3 times of age of son at present . 

i.e. age of father = 3x

6 years ago, the age of son is \(\frac{1}{6}\) of age of father . 

(3x - 6 )= 6 ( x - 6 ) 

3x - 6 = 6x - 36 

3x = 30 

x= 10

Age of father = 3x = 30 years 

As it is mentioned in question that his mother is 5 years younger to his father . At present she is also 5 years younger to his father .

So, age of mother = 30 - 5 = 25 years