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    Question

    The average age of 10 students is 20. If the teacher’s

    age is included, the average rises by 2. Find teacher’s age.
    A 32 yrs Correct Answer Incorrect Answer
    B 42 yrs Correct Answer Incorrect Answer
    C 22 yrs Correct Answer Incorrect Answer
    D 36 yrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    → Sum(10) = 200;

    New sum = 11 × 22 = 242

    ⇒ Teacher = 42.

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