The half life of a specific radionuclide is 8 days. How much of an 80 mg sample will be left after 24 days?

Name: The half life of a specific radionuclide is 8 days. How much of an 80 mg sample will be left after 24 days?
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After 24 days, which is three half-lives (24 days / 8 days per half-life = 3 half-lives), the amount of the substance will have halved three times. Starting with 80 mg, after the first half-life, it would be 40 mg, after the second, 20 mg, and after the third, 10 mg.

The Half Life of a Specific Radionuclide Is 8 Days