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Railways R.R.C. (Kolkata) Solved Paper Held on 17-11-2013

  • question_answer
    The average age of 24 boys and their teacher is 15 years. When the teacher's age is excluded, the average age decreases by 1 year. The age of the teacher is?

    A) 3 8 years                      

    B) 39 years

    C) 40 years           

    D) 41 year

    Correct Answer: B

    Solution :

    Let, the age of the teacher is x years, then? \[25\times 15-x=24\times 14\] \[\Rightarrow \]   \[375-x=336\] \[\therefore \]      \[x=39\,\,years\]


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