Element X is a radioactive isotope such that every 47 years, its mass decreases by half. Given that the initial mass

Element X is a radioactive isotope such that every 47 years, its mass decreases by
half. Given that the initial mass of a sample of Element X is 30 grams, how long
would it be until the mass of the sample reached 21 grams, to the nearest tenth of a
year?


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