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Home Q & A Board Biology-Related Homework Help Medicine Pharmacology (Moderator: DelightfulMind)
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Billkbob Billkbob
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5 years ago
How much of a 10% cream must be mixed with a 0.5% cream to prepare 4 oz. of a 3.75% cream?
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wrote...
#1
Educator
5 years ago
Quote from: Billkbob (5 years 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 -> 0.10
0.5% / 100 -> 0.005

x(.10) + y(.005) = 4(0.0375)

x + y = 4

This 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:
wrote...
#2
4 years ago
thank you so much! after reading my text ten times seeing it worked once and i have it!!
wrote...
#3
Educator
4 years ago
Quote from: meperry1980 (4 years 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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