Problema Solution
A doctor prescribes an ointment that is 4% hydrocortisone. A pharmacist has 1% and 5% concentrations in stock. How many ounces of each should the pharmacist use to make a 6-ounce tube?
Answer provided by our tutors
let
x = ounces of 1% hydro-cortisone
y = ounces of 5% hydro-cortisone
x + y = 6
0.01x + 0.05y = 0.04*6
by solving the above system of equations we find:
x = 1.5 oz
y = 4.5 oz
click here to see the step by step solution of the system of equations:
the pharmacist should use 1.5 oz of the 1% and 4.5 of the 5% hydro-cortisone.