SOLUTION: 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.

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.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
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

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