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OpenStudy (anonymous):

A substance has a half-life of 60,000 years and an initial mass of 1,000 grams. How many years will pass before only 250 grams of the substance's parent material is left?

OpenStudy (xishem):

The half-life of a substance is defined as how long it takes for half of that substance to "disappear". How many times does 1,000 have to be halved to get 250?

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