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Railways Sample Paper RRB (Group D) Sample Test Paper-15

  • question_answer
    Eighteen years ago, the ratio of A's age to B's age was 8:13. Their present ratio's are 5: 7. What is the present age of A?

    A)  70 years          

    B)  50 years

    C)  40 years          

    D)  60 years

    Correct Answer: B

    Solution :

    [b] Let the A's age and B's age was 8x and 13x According to question \[\frac{8x+18}{13x+18}=\frac{5}{7}\] \[\Rightarrow 56x+18\times 7=65x+18\times 5\] \[\Rightarrow \]   \[65x-\,56x=18\times 7-\,18\times 5\] \[\Rightarrow \]               \[9x=18\times 2\] \[\Rightarrow \]               \[x=4\] Hence, the present age of A \[=8\times 4+18=50\,\,yrs.\]


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