New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    The average of 27 numbers is 20.The average of first 13

    numbers is 15 and that of the last 13 numbers is 18. What will be the 27th number?
    A 178 Correct Answer Incorrect Answer
    B 111 Correct Answer Incorrect Answer
    C 190 Correct Answer Incorrect Answer
    D 184 Correct Answer Incorrect Answer

    Solution

    Sum of 27 numbers = 27 ×20 = 540 Sum of first 13 numbers = 13 ×15 = 195 Sum of last 13 numbers = 13 ×18 = 234 Therefore, 27thnumber = 540 – (195 + 234) = 111

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