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18 September, 17:50

The sum of three consecutive odd integers is 18 less than five times the middle number. Find the three integers.

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  1. 18 September, 17:59
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    Let us assume the first odd integer to be = x

    Then

    The consecutive middle odd integer = x + 2

    The third consecutive odd integer = x + 4

    So we can now write the equation as

    x + x + 2 + x + 4 = 5 (x + 2) - 18

    3x + 6 = 5x + 10 - 18

    3x + 6 = 5x - 8

    3x - 5x = - 8 - 6

    - 2x = - 14

    2x = 14

    x = 14/2

    = 7

    So the first odd integer is 7

    The second consecutive odd integer = (x + 2)

    = (7 + 2)

    = 9

    The third consecutive odd integer = (x + 4)

    = 7 + 4)

    = 11

    So the three consecutive odd integers are 7, 9, 11.
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