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The half-life of a certain radioactive isotope is 8 hours. If we start out with 640 grams of the isotope, how many grams will be

The half-life of a certain radioactive isotope is 8 hours. If we start out with 640 grams of the isotope, how many grams will be left (remained or not decayed) after 1 day? How about after 2 days?

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