The age of father 10 years ago was thrice the age of his son. Ten years hence, father's age was five times the age of the son. After 6 years, son's age will be? Choose the correct choice from the following:
A) 7:6
B) 7:3
C) 7:4
D) 7:2
E) 7:1
Let the age of father and son 10 years ago be 3x and x years respectively.   Then, (3x + 10) + 10 = 2[(x + 10) + 10]   3x + 20 = 2x + 40 =&gt; x = 20.   Required ratio = (3x + 10):(x + 10)   = 70:30   = 7:3   Answer: 7:3
<result>B</result>
The age of father 10 years ago was thrice the age of his son. Ten years hence, father's age was five times the age of the son. After 6 years, son's age will be?