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If the half life of a substance is 4 weeks, how long will it take for 400 mg of this substance to decay to 25 mg?
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If the half life of a substance is 4 weeks, how long will it take for 400 mg of this substance to decay to 25 mg?

User RichieRock
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Explanation:

what is meant by mg in this question

User Clarkevans
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