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    Question

    The Average age of 25 pupils in a class is ‘y’

    years. If their principal, aged 50 years, joins them, the average rises by 1 year. Find the value of ‘y’.
    A 22 yrs Correct Answer Incorrect Answer
    B 13 yrs Correct Answer Incorrect Answer
    C 24 yrs Correct Answer Incorrect Answer
    D 40 yrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Sum of the present ages of all the students in the class = 25 × y = 25y years Sum of the present ages of all the students along with the principal = 25y + 50 = 26 × (y + 1) 25y + 50 = 26y + 26 y = 24 So the value of y = 24 years

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