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SSC Sample Paper SSC CGL - Sample Paper-23

  • question_answer
    The average age of 8 men is increased by 2 yr when two of them whose ages are 21 and 23 yr are replaced by two new men. The average of the two new men is

    A) 22 yr                

    B) 24 yr

    C) 28 yr                            

    D) 30 yr

    Correct Answer: D

    Solution :

    Let the average age of two new men \[=x\,yr\] \[\therefore \]      Total age of two new men \[=2x\,yr\] Let the average age of 8 men \[=y\,yr\] \[\therefore \]      \[8y-21-23+2x=8(y+2)\] \[\Rightarrow \]   \[8y-44+2x=8y+16\] \[\Rightarrow \]   \[2x=60\] \[\Rightarrow \]   \[x=30\]


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