SOLUTION: A doctor prescribes an ointment that is 5% hydrocortisone. A pharmacist has 1% and 9% concentrations in stock. How many ounces of each should the pharmacist use to make a 1-ounce t
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Question 401697: A doctor prescribes an ointment that is 5% hydrocortisone. A pharmacist has 1% and 9% concentrations in stock. How many ounces of each should the pharmacist use to make a 1-ounce tube?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Let x=the amount of 1% that is required and 1-x the amount of 9% required.
.01x+.09(1-x)=.05
.01x+.09-.09x=.05
-.08x+.09=.05
-.08x=-.04
x=.5 oz.
.
Ed
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