Multiple Choice Questions on The average age of a group of some persons is 16 75 years By joining 20 new persons with an average ........... for IBPS (PO/SO) Preparation

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Multiple Choice Questions

The average age of a group of some persons is 16 75 years By joining 20 new persons with an average ...........

Quantitative Aptitude(IBPS PO) Problems based on Ages
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    The average age of a group of some persons is 16.75 years. By joining 20 new persons with an average age of 13.25 years, the average age of the group becomes 15 years. Find out the number of persons in the group Initially.

    20

    Correct Answer

    21

    Incorrect Answer

    23

    Incorrect Answer

    24

    Incorrect Answer

    26

    Incorrect Answer
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    Explanation:
    Let the number of persons in the group
    Initially be x, then
    x × 16.75 + 20 × 13.25 = (x + 20) × 15
    ⇒ 1.75x = 20 × (15 – 13.25)
    ⇒ 1.75x = 20 × 1.75
    ⇒ x = 20

    By: Munesh Kumari
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