New Click here to Enroll for SIDBI MSME Expert Classes by Experts

    Register

    Question

    In an Aerobic class, the average age of all the members

    was 54.5 years, 11 members left the class and 7 new members joined. If the average age increased by 3 years and the total age decreased by 140, what was the number of members in the class initially?
    A 30 Correct Answer Incorrect Answer
    B 36 Correct Answer Incorrect Answer
    C 32 Correct Answer Incorrect Answer
    D 40 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the original member be x Total age of these members = 54.5x Total age of (x – 4) members = (54.5x  – 140) years According to the question,  54.5x  – 140 = (x  – 4) `xx` 57.5 ⇒ 54.5x  – 140 = 57.5x  – 230  ⇒ 57.5x  – 54.5x  = 230 – 140 ⇒ 3x = 90  x = 30

    Practice Next

    Relevant for Exams: