New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    The average age of 15 children and their teacher's age

    are 12 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age?
    A 49 years Correct Answer Incorrect Answer
    B 42 years Correct Answer Incorrect Answer
    C 60 years Correct Answer Incorrect Answer
    D 51 years Correct Answer Incorrect Answer
    E 55 years Correct Answer Incorrect Answer

    Solution

    Sum of the age of total children = 16 ×12 = 192 Sum of the age of children after excluding teacher = 15 ×10 = 150 Teacher’s age = 192 – 150 = 42 years

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