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A certain drug has a half-life in the body of 1.5h. Suppose a patient takes one 50.0mg pill at :600PM and another identical pill 45min

A certain drug has a half-life in the body of 1.5h. Suppose a patient takes one 50.0mg pill at :600PM and another identical pill 45min later. Calculate the amount of drug left in his body at :900PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.

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