If we start with q0 milligrams of a certain element, the amount q remaining after t years is given by the formula
Take logarithms of both sides: ln(q) = ln(q_0) + (-t/1500)*ln(2).
(-t/1500)*ln(2) = ln(q) - ln(q_0);
t = 1500*[ln(q_0) - ln(q)]/ln(2).
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