How many grams of a 2.5% hydrocortisone ointment must be mixed with 240g of a 0.25 hydrocortisone cream to make a 1% ointment?
12g
24g
84g
120g
120g
Rationale: 120 grams of a 2.5% hydrocortisone ointment are required. This is an alligation problem. Use the proportion: 1.5 parts / 2.25 parts = 240g / X. So, X = 360g. To calculate the amount of 2.5% ointment needed, subtract the amount of 0.25% ointment from the total weight of the compound. 360g (total weight) – 240g (weight of 0.25% ointment) = 120g (weight of the 2.5% ointment).
Health Professions
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