Question

Josh ingests 800mg of ibuprofen. His body metabolizes (uses up) 20% of the medicine

Answer 1

328 mg medicine is remaining in his system after four hours .

Step-by-step explanation:

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 :

⇒ $800-\frac{800(20)}{100} = 800-160 = 640 mg$

Amount of medicine left after 2 hour :

⇒ $640-\frac{640(20)}{100} =512 mg$

Amount of medicine left after 3 hour :

⇒ $512-\frac{512(20)}{100} =409.6 mg$

Amount of medicine left after 4 hour :

⇒ $409.6-\frac{409.6(20)}{100} =328 mg$

Therefore , 328 mg medicine is remaining in his system after four hours .