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The half-life of radium is 1690 years. If 90 grams are present now, how much will be present in 680 years? grams (Do not round

The half-life of radium is 1690 years. If 90 grams are present now, how much will be present in 680 years? grams (Do not round until the final answer. Then round to the nearest thousandth as needed.)

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