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Railways Sample Paper RRB (Assistant Loco Pilot & Technician) Sample Test Paper-12

  • question_answer
    The average age of the students of a class is 25. Five students of average age 20 joined the class and the average age of the whole class is reduced to 24. The original strength of the class was?

    A)  10                               

    B)  20

    C)  30                   

    D)       35

    Correct Answer: B

    Solution :

     Let the original strength of class \[=x\] New average \[=\frac{x\,\,\,\,\,\,\,25+5\,\,\,\,\,\,20}{x+5}=24\]              \[24(x+5)=25x+100\]  \[24x+120=25x+100\]  \[x=20\]


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