percentage/dosage solutions

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Danna in Mercer Island, Washington

30 months ago

I am stuck on these 2 problems, and the formulas that I am using I don't believe are working to find the correct answer.

Problem #1
You have 4 oz of a 50% solution. If 500 mL was added to the 50% solution what is the percentage strength of the new solution?

Problem #2
If 14 grams of petrolatum is added to 25 grams of 0.2% hydrocortisone ointment, what will be the final percent concentration of the hydrocortisone?

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