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 most appropriate option.
A) 5:2
B) 7:3
C) 9:2
D) 13:4
E) 3:4
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: