Calculate the amount of hydrocortisone cream needed to prepare 45 g of a 1.5% hydrocortisone cream using 2% hydrocortisone cream and a cream base: ________.
Fill in the blank(s) with the appropriate word(s).
33.75 g
Use the alligation method. A total of 1.5 parts of the 2% cream is needed, and 0.5 part of the cream base is needed, for a total of 2 parts.
45 g needed ÷ 2 parts = 22.5 g per part
22.5 g × 1.5 part = 33.75 g of the 2% cream
22.5 g × 0.5 part = 11.25 g of the cream base
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