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    Question

    The average height of each student in a class of 35

    students is 140 cm. If 2 new students joined the class, then the average height of the each student in the class increases by 6 cm. Find the average height of 2 new students who joined the class.
    A 151 cm Correct Answer Incorrect Answer
    B 351 cm Correct Answer Incorrect Answer
    C 241 cm Correct Answer Incorrect Answer
    D 231 cm Correct Answer Incorrect Answer
    E 251 cm Correct Answer Incorrect Answer

    Solution

    Total height of 35 students of the class = 140 × 35 = 4900 cm When 2 new students joined the class, average height of each student = 140 + 6 = 146 cm Total height of 37 students of the class = 146 × 37 = 5402 cm Average height of 2 new students who joined the class = {(5402 – 4900)/2} = 502/2 = 251 cm

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