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# Pharmacy math

wrote...
Posts: 1
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A year ago
 Pharmacy math How much of a 10% cream must be mixed with a 0.5% cream to prepare 4 oz. of a 3.75% cream? Read 128 times 3 Replies

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wrote...
Educator
A year ago
 Quote from: Billkbob (A year ago)How much of a 10% cream must be mixed with a 0.5% cream to prepare 4 oz. of a 3.75% cream?Let x and y be volumes in ounces of the different creams, and convert the percentages into decimals.10% / 100 -> 0.100.5% / 100 -> 0.005x(.10) + y(.005) = 4(0.0375)x + y = 4This is a system of linear equations.The answer is:x = 1.36 oz of 10%y = 2.63 oz of 0.5%If you'd like to see how it's done mathematically, watch:
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wrote...
A month ago
 thank you so much! after reading my text ten times seeing it worked once and i have it!!
wrote...
Educator
A month ago
 Quote from: meperry1980 (A month ago) thank you so much! after reading my text ten times seeing it worked once and i have it!! You're welcome. Anything else, just start a new topic :-)
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