Use the formula in terms of half life from the normal exponential functions <span> N(t) = N(0) (1/2) ^ (t/thalf) </span> <span> N(0) is the original quantity </span> <span> N(t) = quantity remaining at time t </span> <span> t is the time </span> <span>
thalf is half life </span> <span> 1/16 = (1/2)^(t/3.82) </span> <span> 16 = 2^(t/3.82) </span> <span> 4 = t/3.82 </span> <span> t = 15.28 days
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