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7 January, 09:11

If 15% of 30% of 50% of a number is 90, then what is the number?

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  1. 7 January, 09:21
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    Eg. n is the number

    15% * 30% * 50% * n = 90

    15/100 * 30/100 * 50/100 * n = 90

    3/20 * 3/10 * 1/2 * n = 90

    n = 90 * 2/1 * 10/3 * 20/3

    n = 180 * 10/3 * 20/3

    n = 600 * 20/3

    n = 4,000

    The number is 4,000
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