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      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, 27th number = 540 – (195 + 234) = 111

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