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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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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    2021-09-09T15:31:21+00:00

    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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