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      Question

      The average of 10 numbers is 102. The average of the

      first 5 numbers is 78 and the average of the last 4 numbers is 46. What is the 6th number?
      A 530 Correct Answer Incorrect Answer
      B 690 Correct Answer Incorrect Answer
      C 446 Correct Answer Incorrect Answer
      D 703 Correct Answer Incorrect Answer

      Solution

      Total sum of 10 numbers = 10 Γ— 102 = 1020 Sum of first 5 numbers = 5 Γ— 78 = 390 Sum of last 4 numbers = 4 Γ— 46 = 184Β  According to question, => 1020 – (390 + 184) = 446

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