Calculate the amount of 5% zinc oxide ointment needed to prepare 50 g of 15% zinc oxide ointment, using 30% and 5% zinc oxide stock products: ________.
Fill in the blank(s) with the appropriate word(s).
30 g
Use the alligation method. A total of 10 parts of 30% zinc oxide ointment are needed, and 15 parts of 5% zinc oxide ointment are needed, for a total of 25 parts.
50 g needed ÷ 25 parts = 2 g per part
2 g × 15 = 30 g of 5% zinc oxide ointment
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