A certain radioactive element decays to 1 2 of its original amount every 20 years If there was 100mg to

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How many times can you subtract 7 from 83, and what is left afterwards? You can subtract it as many times as you want, and it leaves 76 every time.

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Latest exam Aptitude Question SOLUTION: A certain radioactive element decays to 1/2 of its original amount every 20 years. If there was 100mg to start with, how much will be present after 200 years? Set up an equation an