Present age of father is 42 years and that of his son is 14 years. Find the ratio of

**(a)** Present age of father to the present age of son.

**(b)** Age of the father to the age of son, when son was 12 years old.

**(c)** Age of father after 10 years to the age of son after 10 years.

**(d)** Age of father to the age of son when father was 30 years old.