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Stumped on a simple question watch

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    A large jar of marmalade contains 12.5% more than a standard jar. The large jar has 450g in it.
    How much does a standard jar hold.

    How do I work this out without a calculator ?
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    Put into fractions:

    12.5% is 1/8

    450 is 9/8 of a standard jar
    so 50 is 1/8 of a standard jar
    so 400 is 8/8 of a standard jar
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    Thanks

    Is that the way you get shown at Standard grade ?
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    (Original post by jjlang)
    Thanks

    Is that the way you get shown at Standard grade ?
    I'm not sure about standard grade!

    It's certainly the case that it's often a good idea to be able to convert certain percentages instantly in your head into fractions:

    2.5, 5, 10, 12.5, 20, 25.
 
 
 
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Updated: February 2, 2006

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