An adult takes 800 mg of ibuprofen. Each hour, the amount of ibuprofen in the person's system decreases by
about 20% How much ibuprofen is left after 6 hours? (Round to the nearest whole number)

Megan and desmond each add the same amount of water to their aquarium megan makes 5 ml of chemical solution with every gallon of water for her aquarium desmond mixed 8 ml of chemical solution for every 2 gallon of the water for his aquarium.