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Math Help - Percentage

  1. #1
    Junior Member
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    Percentage

    An ore contains 8% copper.How many kilograms of the ore are required to get 68kg of copper?
    (a)544 kg
    (b)5.44 kg
    (c)85 kg
    (d)850 kg.
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  2. #2
    MHF Contributor
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    68 kg is 8% of what?

    (a)544 kg
    (b)5.44 kg <== Get rid of this one immediately. Way too small.
    (c)85 kg
    (d)850 kg.

    (a)544 kg
    (c)85 kg <== Throw this one out. It's barely greater than 68 kg
    (d)850 kg.

    (a)544 kg <== Discard this one. 10% is 54.4 kg 8% is less.
    (d)850 kg.

    (d)850 kg. <== Only one left. 850 kg * 8% = 850 kg * 0.08 = 68 kg -- Perfect.
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  3. #3
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    To learn more about percentages, particularly this problem and the math involved, enter what TKHunny had and press the 2nd button here:

    Percentage-Decimal-Fraction Relations
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