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      Question

      The average of 9 numbers is 100. The average of the

      first 4 numbers is 65 and the average of the last 4 numbers is 40. What is the 5th number?
      A 412 Correct Answer Incorrect Answer
      B 480 Correct Answer Incorrect Answer
      C 446 Correct Answer Incorrect Answer
      D 403 Correct Answer Incorrect Answer

      Solution

      Total sum of 9 numbers = 9 × 100 = 900 Sum of first 4 numbers = 4 × 65 = 260 Sum of last 4 numbers = 4 × 40 = 160 According to question, => 900 – (260 + 160) = 480

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