Donald's body metabolizes caffeine at a rate of 13.7% per hour (so the amount of caffeine in Donald's body decreases by 13.7% each hour).
If Donald consumes a cup of coffee with 92 mg of caffeine in it, how long will it take for Donald's body to metabolize half of the 92 mg of caffeine?
hours
If Donald consumes an energy drink with 194 mg of caffeine in it, how long will it take for Donald's body to metabolize half of the 194 mg of caffeine?
hours
If Donald consumes a cup of coffee with cc mg of caffeine in it, how long will it take for Donald's body to metabolize half of the cc mg of caffeine? (Hint: your answer will be a numerical value.)
hours
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