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      Question

      A set contains ten numbers. The average of the first six

      numbers is (x - 4), and the average of the last three numbers is (x + 2). The average of the entire set is 'x'. If the 7th number of the set is 28, then find the value of 'x'.
      A 10 Correct Answer Incorrect Answer
      B 14 Correct Answer Incorrect Answer
      C 28 Correct Answer Incorrect Answer
      D 18 Correct Answer Incorrect Answer
      E 12 Correct Answer Incorrect Answer

      Solution

      Sum of the numbers of set = 10x Sum of first 6 numbers = 6(x βˆ’ 4) = 6x βˆ’ 24 Sum of last 3 numbers = 3(x + 2) = 3x + 6 ATQ, 6x βˆ’ 24 + 28 + 3x + 6 = 10x 9x + 10 = 10x x = 10

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