Question

16 mL of medication are given and 25% of it is being purified every 4 hours. How would you create an equation knowing that 3/4 of the 16 mL is left after the 1st 4 hour period and the 9/16 is left after the 2nd 4 hour period, 8 hours. So how would you create an equation where n is the 4 hour periods and a id the amount of medication left. Also, 4 hours=12 mL, 8 hours=9 mL, 12 hours= 6.75 mL, and 16 hours= 5.06 mL