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Railways Sample Paper RRB (Group D) Sample Test Paper-4

  • question_answer
    The average age of 120 members of a society is 60.7 years. By addition of 30 new members, the average age becomes 56.3 years. What is the average age (in years) of newly joined members?

    A)  36.5                

    B)  37.2

    C)  38.3                

    D)  38.7

    Correct Answer: D

    Solution :

     Let average age of newly joined member =x According to question, \[120\times 60.7+30\times x=150\times 56.3\] \[7284+30x=8445\] \[\therefore 30x=8445-7284\] \[\,\,\,\,\,30x=1161\] \[\therefore x=\frac{1161}{30}=38.7\]


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