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After three half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to start?

User SpamBot
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2 Answers

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i think that the answer is 40...................................
User Amitash
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The answer is actually (80). 80/2 is 40, 40/2 is 20, and 20/2 is 10, thus the answer is 80.

User Rmaruszewski
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