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If you begin with 40 grams of a radioactive isotope and end with 10 grams, how many half-lifes of the radioactive isotope have passed ?
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If you begin with 40 grams of a radioactive isotope and end with 10 grams, how many half-lifes of the radioactive isotope have passed ?

User Adriano Monecchi
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30 grams of radioactive isotope have passed.
User Jainish Shah
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