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4 December, 10:53

If 30% of John's photographs were perfect, but 210 photographs were not perfect, then how many photographs were there in all?

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  1. 4 December, 14:13
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    If 30% were perfect, 70% were not perfect. So we know that 70% of the total number of photographs is 210.

    p (70/100) = 210 multiply both sides by 100

    70p=21000 divide both sides by 70

    p=300

    So there are 300 photographs in all.
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