2. Questions Bank
  3. 9th Class
  4. Mental Ability
  5. Related to Competitive Exam

9th Class Mental Ability Related to Competitive Exam Question Bank Arithmetical Reasoning

  • question_answer
    The age of a father 10 years ago was thrice the age of his son. Ten years later, the father's age will be twice that of his son. The ratio of their present ages is:

    A) \[8:5\]                  

    B)         \[7:3\]

    C) \[5:2\]                   

    D)        \[9:5\]

    E) None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. Let the age of the son 10 years ago be x years. \[\therefore \] Father?s age 10 years ago would be 3x years. Now as per the information given in question, \[3x+20=2\left( x+20 \right)\] or     \[x=20\] \[\therefore \] Ratio of their present ages \[=\left( 3x+10:x+10 \right)=70:30=7:3\]


You need to login to perform this action.
You will be redirected in 3 sec spinner