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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-5

  • question_answer
    Out of 10 teachers of a school, one teacher retires and in his place, a new teacher of age 25 yr joins. As a result average age of teachers reduces by 3 yr. The age of the retired teacher is

    A)  50 yr   

    B)  55 yr

    C)  58 yr   

    D)  60 yr

    Correct Answer: B

    Solution :

    Let the age of retired teacher = x yr and average of 10 teachers = y yr \[\therefore \,\]    \[y-3=\frac{10y-x+25}{10}\] \[\Rightarrow \]   \[10y-30=10y-x+25\] \[\Rightarrow \]               \[x=\,\,55\]


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