The age of father 5 years ago was four times the age of his son. Five years hence, father's age will be twice that of his son. The ratio of their present ages is:
Choose the correct option:	A) 5 : 4	B) 7 : 4	C) 5 : 2	D) 5 : 3	E) 7 : 5
Let the ages of father and son 5 years ago be 4x and x years respectively.   Then, (4x + 5) + 5= 2[(x + 5) + 5]   4x + 10 = 2x + 20   x = 5.   Required ratio = (4x + 5) : (x + 5) = 25: 10= 5 : 2.   Answer: Option 5 : 2
<result>C</result>
The age of father 5 years ago was four times the age of his son. Five years hence, father's age will be twice that of his son. The ratio of their present ages is: