A man's age is three times that of his son. In twelve years, he will be twice as old as his son would be. What are their present ages?
a) Present age of man is 60 years and present age of son is 20 years.
b) Present age of man is 45 years and present age of son is 15 years.
c) Present age of man is 54 years and present age of son is 18 years.
d) Present age of man is 36 years and present age of son is 12 years.
