New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    The average age of 23 children and their teacher's age are 21 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?

    A 45 years Correct Answer Incorrect Answer
    B 42 years Correct Answer Incorrect Answer
    C 44 years Correct Answer Incorrect Answer
    D 52 years Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Sum of the age of total children and teacher = 24 × 21 = 504 Sum of the age of children after excluding = 23 × 20 = 460 Teacher’s age = 504 – 460 = 44 years

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