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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    Ten years hence a man will be twice as old as his son, but two years ago he was four times as old as his son then was. Find the age of the father.

    A) 26 years    

    B) 28 years

    C) 30 years                      

    D) 35 years

    Correct Answer: A

    Solution :

    Let the present ages of father and son be x years and y years respectively. \[x+10=(y+10)\times 2\]\[\left( -\frac{3}{4},2 \right)\] \[x-2y=10\]              ?(1) \[x-2=(y-2)\times 4\]\[\frac{1}{x}-\frac{3}{4}+\frac{1}{2+x}=0\] \[x-4y=-6\]     ...(2) Solving equation (1) and (2), we get \[(5,4)\]           


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