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15 November, 17:51

The average of five numbers is 12.4. the average of four of these numbers is 11. what is the value of the fifth number?

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Answers (2)
  1. 15 November, 18:33
    0
    average of 4 numbers is 11 so 11*4 = 44

    average of 5 numbers is 12.4 so 12.4*5 = 62

    the 5th number = 62-44 = 18
  2. 15 November, 20:08
    0
    Take 4*11 that makes the answer 44

    Then yake 5*12.4 and that is 62

    Take 62-44

    The answer is 18
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