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    Question

    The average height of each student in a class of 25

    students is 150 cm. If 10 new students joined the class, then the average height of the each student in the class increases by 3 cm. Find the average height of 10 new students who joined the class.
    A 150.5 cm Correct Answer Incorrect Answer
    B 180.5 cm Correct Answer Incorrect Answer
    C 120.5 cm Correct Answer Incorrect Answer
    D 140.5 cm Correct Answer Incorrect Answer
    E 160.5 cm Correct Answer Incorrect Answer

    Solution

    Total height of 25 students of the class = 150 × 25 = 3750 cm When 10 new students joined the class, average height of each student = 150 + 3 = 153 cm Total height of 35 students of the class = 153 × 35 = 5355 cm Average height of 10 new students who joined the class = {(5355 – 3750)/10} = 1605/10 = 160.5 cm

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