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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