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8 December, 20:00

The average of 3 numbers is 7. two of the numbers are 8 and 9. what is the third?

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Answers (2)
  1. 8 December, 20:02
    0
    (8+9+x) / 3=7

    (17+x) = 21

    x=4
  2. 8 December, 20:28
    0
    Make an equation. x will be the third number.

    To find the average, you add up the numbers then divide the sum by the number of numbers you added up.

    (8 + 9 + x) : 3 = 7

    Now solve. Add up like terms (8 + 9).

    (17 + x) : 3 = 7

    Multiply both sides by 3.

    17 + x = 21

    Subtract both sides by 17.

    x = 4

    The third number is 4.
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