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328 mg medicine is remaining in his system after four hours .
<u>Step-by-step explanation:</u>
Here we have , Josh ingests 800 mg of ibuprofen. His body metabolizes (uses up) 20% of the medicine per hour.We need to find How much medicine is remaining in his system after four hours .Let's find out:
According to question , Josh ingests 800 mg of ibuprofen and His body metabolizes (uses up) 20% of the medicine per hour . let amount of medicine left after 4 hours is x , So Amount of medicine left after 1 hour :
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Amount of medicine left after 2 hour :
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Amount of medicine left after 3 hour :
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Amount of medicine left after 4 hour :
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Therefore , 328 mg medicine is remaining in his system after four hours .