Homework Help: algebra

Posted by rf on Sunday, October 9, 2011 at 9:48pm.

how many mls of pure water does a pharmacist have to add to 50mls of a 15% minoxide solution to get a 10% minoxide solution?

algebra - Steve, Monday, October 10, 2011 at 11:07am
The total solute must add up. Pure water is 0% solution:

w(0) + 50(.15) = (w+50)(.10)
7.5 = .10w + 5
.10w = 2.5
w = 25 ml

Just to check. We added 50% more volume. The volume is 3/2 what it was, so the concentration is 2/3 what it was.

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