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If 85% of an aspirin remains in the bloodstream after 3.0 h, how long after an 80 mg aspirin is taken does it take for there to be 35 mg in the blood




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Aspirin consumed 15 % in 3 hrs

35 mg out of 80 mg  is =  43.75%

Time duration :  \frac{3 hours}{15}* 43.75 = 8.75 hours

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