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11 July, 06:38

A "drug dissipates at a continuous rate" 12% per hour. how long until a quarter of the drug is left.

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  1. 11 July, 07:29
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    It would take 6 hours and 15 minutes.

    Add 12 to itself until you reach near 75%. 6 x 12 = 72

    This leaves 3 % still to go. 3% is one fourth of 12, so it would be 6 and 1/4 hours which is 6hrs and 15 min.
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