Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-28

  • question_answer
    A man's age was 5 times his son's age 5 yr ago and he will be three times his son's age after 2 yr. The ratio of their present ages is

    A)  5 : 2                

    B)  5 : 3

    C)  10 : 3  

    D)  11 : 5

    Correct Answer: C

    Solution :

    Let 5 yr ago, the son's age be xyr and man's age be 5x yr. Their present ages are\[\left( x+5 \right)yr\]and\[\left( 5x+5 \right)\,yr.\] \[3\left( x+5+2 \right)=\left( 5x+5+2 \right)\] \[\Rightarrow \]   \[3\left( x+7 \right)=\left( 5x+7 \right)\Rightarrow 2x=14\] \[\Rightarrow \]               \[x=7\] Ratio of present ages of man and son \[=(5\times 7+5):(7+5)=40:12=10:3\]

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