Question

    The average age of a group of 8 friends is 30 years. If

    one of them leaves, the average becomes 29. Find the age of the friend who left.
    A 35 years Correct Answer Incorrect Answer
    B 36 years Correct Answer Incorrect Answer
    C 37 years Correct Answer Incorrect Answer
    D 38 years Correct Answer Incorrect Answer

    Solution

    Let the age of the person who left be ‘x’ years. So, x + (30 – 1) × 7 = 8 × 30 x + 29 × 7 = 240 x + 203 = 240 x = 240 – 203 x = 37 years So, age of the person who left was 37 years.

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