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      Question

      The average of three numbers is 60. When three more numbers

      are included, the average increases by 6. Find the average of the numbers included.
      A 70 Correct Answer Incorrect Answer
      B 72 Correct Answer Incorrect Answer
      C 74 Correct Answer Incorrect Answer
      D 76 Correct Answer Incorrect Answer

      Solution

      Sum of the 3 numbers = 60 × 3 = 180
      New average = 60 + 6 = 66
      Sum of 6 numbers = 66 × 6 = 396
      Sum of new 3 numbers = 396 - 180 = 216
      Required average = 216 ÷ 3 = 72

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