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Railways Sample Paper RRB (Group D) Sample Test Paper-12

  • question_answer
    The sum of the present ages of father and son is 90 years. 10 years earlier the ratio of their ages was 5: 2. The present age of the father is:

    A)  65                   

    B)  68

    C)  70                   

    D)  60

    Correct Answer: D

    Solution :

    [d] Let present age of father=x Present age of son=y According to question, \[x+y=90\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,...(i)\]                  ? (i) Now, \[\frac{x-\,10}{y-\,10}=\frac{5}{2}\] \[2x-\,20=5y-\,50\] \[2x-\,5y=-\,30\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,...(ii)\]                      ? (ii) From eq. (i) and (ii) x=60 y=30 \[\therefore \]The present age of mother = 60 years.


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