Question

Dr. Cohn is testing how long it takes for a person's body to process a new medicine. She observes that the medicine is used by the body at a constant rate. For her latest test, Dr. Cohn starts with 15 milligrams of the medicine and notes that 12.6 milligrams remain unused after 1 hour. Which equation could Dr. Cohn use to solve for p, the percentage of the medicine that is used in 1 hour? A. p100=12.615 B. p100=2.415 C. p15=1002.4 D. p15=10012.6

Answer 1

the options were not copied correctly, option B could be correct but it is missing the division signs:

B. p / 100 = 2.4 / 15

the percentage of medicine used in 1 hour:

p / 100 = (15 - 12.6) / 15 = 2.4 / 15

p / 100 = 0.16

p = 0.16 x 100 = 16%

another option could be C but it would be missing the multiplication signs:

C. p x 15 = 100 x 2.4

p x 15 = 240

p = 240 / 15 = 16%