Question 287854
A doctor prescribes medicine. The patient must take 7.5mL every 6 hours. If the bottle contains 67.5mL of medicine, for how long must the patient take the medicine?
a) 30 hrs. b) 36 hrs. c) 48 hrs. d) 54 hrs. e) 60 hrs.
.
Since each dose is 7.5 mL
and the bottle contains 67.5 mL
then
number of doses = 67.5/7.5
number of doses = 9 
.
and since he takes a dose every 6 hours:
He would take the first dose immediately then the next 8 every 6 hours:
8*6 = 48 hours