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The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg?

The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg?

A. 4 days
B. 12 days
C. 16 days
D. 8 days
E. None of these