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10th Class Mathematics Pair of Linear Equations in Two Variables Question Bank MCQs - Pair of Linear Equations in Two Variables

  • question_answer
    At present ages of a father and his son are in the ratio \[7:3,\] and they will be in the ratio \[2:1\] after 10 years. Then the present age of father (in years) is:

    A) 42

    B) 56

    C) 70

    D) 77

    Correct Answer: C

    Solution :

    [c] Let the ages of father and son be \[7x,3x\]
    Hence,   \[(7x+10):(3x+10)=2:1\]
    or                   \[x=10\]
    Age of the father is 70 years.


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