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      Question

      The average of 10 numbers is 42. If the average of the

      first 4 numbers is 24 and the average of the last three numbers is 36, then what is the average of the remaining numbers?
      A 72 Correct Answer Incorrect Answer
      B 69 Correct Answer Incorrect Answer
      C 88 Correct Answer Incorrect Answer
      D 27 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Sum of the 10 numbers = 10 × 42 = 420

      Sum of the first 4 numbers = 4 × 24 = 96

      Sum of the last 3 numbers = 3 × 36 = 108

      Sum of the remaining numbers = 420 - 96 - 108 = 216

      Required average = 216 / 3 = 72

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