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Math Help - word problem help

  1. #1
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    word problem help

    Hi everyone, I have a word problem that I am trying to help my son with any information will be greatly appreciated.

    Find three consecutive odd integers such that the second is at most three less than twice the sum of the first and third.

    He needs the equation they gave him -1 , 1, 3
    Last edited by krrice; August 27th 2012 at 04:19 PM.
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  2. #2
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    Re: word problem help

    Hello, krrice!

    Find three consecutive odd integers such that the second
    is at most three less than twice the sum of the first and third.

    He needs the equation.
    They gave him -1 , 1, 3. . Is that the answer?
    There is more than one answer.

    Let the three consecutive odd integers be: . x,\,x\!+\!2,\,x\!+\!4

    \underbrace{\text{Second}}_{x+2}\; \underbrace{\text{is at most}}_{\le}\;\underbrace{\text{twice}}_{2\;\times  } \;\underbrace{\text{sum of first and third}}_{x+(x+4)}\;\underbrace{\text{minus 3}}_{-\;3}

    We have: . x+2 \;\le\;2\big[x+(x+4)\big] - 3

    . . . . . . . . x + 2 \;\le\;4x + 8 - 3

    . . . . . . . . . -3x \;\le \; 3

    . . . . . . . . . . . x \;\ge\;-1


    So, [-1,1,3] is a solution.

    But so are: . \begin{Bmatrix}[1,3,5] \\ [3,5,7] \\ [5,7,9] \\ \vdots \end{Bmatrix}
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