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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-19

  • question_answer
    The average age of four boys five years ago, was 9 years. On including a new boy, the present average age of all the five becomes 15 years. The present age of the new boy is:

    A)  14 years                      

    B)  6 years

    C)  15 years                      

    D)  10 years

    Correct Answer: D

    Solution :

      \[{{B}_{1}}+{{B}_{2}}+{{B}_{3}}+{{B}_{4}}=36\]  year \[({{B}_{1}}+5)+({{B}_{2}}+5)+({{B}_{3}}+5)+({{B}_{4}}+5)+{{B}_{5}}\] \[=\,\,\,\,15\times 5,\,\,\,{{B}_{5}}+20+36=15\times 5=75\] \[{{B}_{5}}=75-56={{B}_{5}}=\,\underline{\,\mathbf{19}\,\,\mathbf{years}}\]


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