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

  • question_answer
    After five years, the age of a father will be thrice the age of his son, whereas five years ago, he was seven times old as his son was. What is father's present age?

    A) 35 years             

    B)        40 years

    C) 45 years               

    D)        50 years

    E) None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. Let the age of son after 5 years be x years. Then, the age of father after 5 years would be 3x years. Five years ago the age of son = (x ? 10) years. Five years ago the age of father = (3x ? 10) years According to the given information in the question, \[\left( 3x-10 \right)=7\left( x-10 \right)\] or      \[3x-10=7x-70\] or      \[4x=60~~or~~~x=15\] years Therefore, present age of father would be (3x ? 5) years or (45 ? 5) = 40 years.


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