Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-12

  • question_answer
    Mr. "X' is twice his daughter's present age. How many years ago, was the three times his daughter's age, if his daughter's present age is 20 yr?

    A)  15                   

    B)  12

    C)  10       

    D)  8

    Correct Answer: C

    Solution :

    Present age of daughter= 20 yr, then Mr. ?X? present age \[=20\times 2=40\,\,yr\] According to questions, \[3(20-x)=40-x\] \[\Rightarrow \]   \[60-3x=40-x\] \[\Rightarrow \]   \[2x=20\Rightarrow \,\,\,\,\,x=10\,\,yr\]

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