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  1. #1
    Sezy's Avatar
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    Question Maths/science help

    Im terrible at maths. I think its the wording here that is getting me confused

    Question


    Pie Chart


    Equation example


    My units for calculation


    I would really appreciate any help or guidance. I honestly don't know where to even start here
    I did come up with the answer of 0.9hrs which just doesn't seem right to me o_O

  2. #2
    Rylai's Avatar
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    Hi, I tried out your problem sum! Disclaimer: I'm not that good at math either, so it would be great if you could cross check with someone else too!

    I got 0.899h as well (3 significant figures).

    I think this question is similar to the last example.

    Cleaning house uses 12kJ kg-1 h-1.
    Your fat consumed is 1295kJ. (I'm assuming that you calculated your fat consumed correctly!)
    Your weight is 120kg.

    So 12kJ kg-1 h-1 * 120kg * unknown number of hours = 1295kJ

    Unknown number of hours = 1295kJ / (12kJ kg-1 h-1 * 120 kg) = 0.899 h

    The kJ on the numerator cancels the kJ on the denominator. the kg-1 on the denominator cancels the kg in the denominator. Since h-1 is in the denominator, you end up with h as the final unit because (h-1)-1 = h.

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    Sezy (11-15-2020)

  4. #3
    Mario2302's Avatar
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    i've just also taken a look at it (and used to be quite good at maths though i'm not really involved with it that much anymore these days)

    i also come up with the same answer as @(you need an account to see links) and very similar to the one you yourself calculated (0.899 hours).
    Keep in mind that it should be 0.899 hours as 3 significant numbers have been asked in the question

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    Sezy (11-15-2020)

  6. #4
    Sezy's Avatar
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    Thank you both so much

    I rounded it up which is why I think I got so confused then XD

  7. The Following User Says Thank You to Sezy For This Useful Post:

    Rylai (11-15-2020)

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