New SIDBI Grade A New Batch Starts on Nov 18

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    Question

    The average age of 25 children and their teacher's age are 20 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 48 years Correct Answer Incorrect Answer
    D 52 years Correct Answer Incorrect Answer

    Solution

    Sum of the age of total children and teacher = 26 × 20 = 520 Sum of the age of children after excluding = 25 × 19 = 475 Teacher’s age = 520 – 475 = 45 years

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