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Math Help - Drug calculation help

  1. #1
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    Drug calculation help

    Hey everyone, I'm not a mathematician and actually struggle with maths anyway. I was doing this drug calculation and we have to show all our working out in detail and I'm struggling.


    A patient has been prescribed 335 mg of drug X suspension. How many
    mls would you administer?

    The label on Drug X states 250mg/5ml

    So the answer is 6.7 mls which I would draw up in a syringe

    But I can't seem to get to that answer on paper. I'm suppose to divide 335 by 250 x 5 = 6.7 mls

    But to do this using long division on paper without a calculator and I have to do 250/335 I am getting 1 r 85. This is my working out in detail...

    1x 250 / 335
    2x 500 -250 1
    4x 1000 = 85 = 1
    8x 2000

    Answer = 1 with remainder 85

    Where am I going wrong? How to I get to 6.7 ???
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  2. #2
    Senior Member MaxJasper's Avatar
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    Lightbulb Re: Drug calculation help

    How about using an abacus
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  3. #3
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    Re: Drug calculation help

    Good question well i trying this question...
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  4. #4
    MHF Contributor MarkFL's Avatar
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    Re: Drug calculation help

    I would state:

    \frac{x}{335}=\frac{5}{250}=\frac{1}{50}

    and so:

    x=\frac{335}{50}=\frac{67}{10}=6.7
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  5. #5
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    Re: Drug calculation help

    it is given that drug contains 250 mg in 5 ml
    So 1 mg will be contained in 5/250 and 335 ml in (5/250)x 335 = ( 1/50 ) x 335 = 67 / 10 = 6.7 ml
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