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    Question

    The average height of each student in a class of 25

    students is 130 cm. If 10 new students joined the class, then the average height of the each student in the class increases by 4 cm. Find the average height of 10 new students who joined the class.
    A 158 cm Correct Answer Incorrect Answer
    B 144 cm Correct Answer Incorrect Answer
    C 138 cm Correct Answer Incorrect Answer
    D 198 cm Correct Answer Incorrect Answer
    E 148 cm Correct Answer Incorrect Answer

    Solution

    Total height of 25 students of the class = 130 times; 25 = 3250 cm When 10 new students joined the class, average height of each student = 130 + 4 = 134 cm Total height of 35 students of the class = 134 times; 35 = 4690 cm Average height of 10 new students who joined the class = {(4690 ndash; 3250)/10} = 1440/10 = 144 cm

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