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Math Help - Equation

  1. #1
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    Equation

    Hi guys just wondering if you could help me out with this question i know the answer is 10 but im not sure how the eqution is set up?
    The amount of sleep ( s hours) a child needs depends on its age (A years)., and is given bu the foruma above S=15-1/2 (half)A

    If a girls age is equal to the number of hours she should be sleeping how old is she
    Thanks


    Sam
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  2. #2
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    Mistake

    OOps this is in the wrong forum sorry
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  3. #3
    Bar0n janvdl's Avatar
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    Quote Originally Posted by bassmansam View Post
    Hi guys just wondering if you could help me out with this question i know the answer is 10 but im not sure how the eqution is set up?
    The amount of sleep ( s hours) a child needs depends on its age (A years)., and is given bu the foruma above S=15-1/2 (half)A

    If a girls age is equal to the number of hours she should be sleeping how old is she
    Thanks


    Sam
    S = 15 - \frac{1}{2} A

    S = A (Given)

    So S and A = x

    x = 15 - \frac{1}{2} x

    [Multiply both sides by 2]

    2x = 30 - x

    3x = 30

    x = 10
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by bassmansam View Post
    OOps this is in the wrong forum sorry
    Isn't this a middle school problem?
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  5. #5
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    im at university so i would guess it is a university question?
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  6. #6
    Bar0n janvdl's Avatar
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    Quote Originally Posted by bassmansam View Post
    im at university so i would guess it is a university question?
    I'm not trying to be funny, but I did stuff like this in grade 10...
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  7. #7
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    well i am from england, maybe that is why?
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  8. #8
    Bar0n janvdl's Avatar
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    Quote Originally Posted by bassmansam View Post
    well i am from england, maybe that is why?
    What are you studying, if i may ask?
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  9. #9
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    Im studying Computing
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  10. #10
    Bar0n janvdl's Avatar
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    Quote Originally Posted by bassmansam View Post
    Im studying Computing
    Oh that explains it. It's not very heavy on maths.
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