11. How many grams each of resorcinol and hexachloro-
phene should be used in preparing 2 pounds of an
acne ointment that is to contain 2% resorcinol and
0.25% of hexachlorophene?

12. How many milligrams of procaine hydrochloride
should be used in preparing 60 suppositories, each
weighing 2 grams and containing 1/4% of procaine
hydrochloride?