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

    Question

    There are 15 numbers such that average of first 12

    numbers is 65 while the average of last five numbers is 70. Find the 12th number, if the ratio between 11th and 12th number is 13:7, respectively.
    A 150.5 Correct Answer Incorrect Answer
    B 100.5 Correct Answer Incorrect Answer
    C 170.5 Correct Answer Incorrect Answer
    D 120.5 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Sum of first 12 numbers = (12 x 65) = 780 Sum of last 5 numbers = (70 x 5) = 350 Sum of 11th and 12th number = (780 - 350) = 430 So, 12th number = 430 x (7/20) = 150.5

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