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23 January, 04:14

The percent decrease from 12 to 9 is equal to the percent decrease from 40 to what number

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  1. 23 January, 05:37
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    (12 - 9) / 12 = (40 - x) / 40

    3/12 = (40 - x) / 40

    40 (1/4) = 40 - x

    10 = 40 - x

    10 - 40 = - x

    -30 = - x

    30 = x < = = = percent decrease from 40 to 30
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