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12 July, 02:00

15 grams of a radioactive substance decayed 11% over the course of 3 weeks. How many grams of the substance were left after the 3 weeks?

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  1. 12 July, 02:21
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    15 grams lost 11%

    get 11% of 15 =.11 times 15 = 1.65

    now subtract

    15 - 1.65 = 13.35 grams left
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