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April 19, 2015

April 19, 2015

Posted by **Karen** on Sunday, August 5, 2012 at 3:07pm.

- math -
**MathMate**, Sunday, August 5, 2012 at 3:58pmHere's visual way to calculate, which will let you do it mentally:

given cream concentrations**1%**----- 4% -----*6%*

----*3%*--------**2%**---- Difference

Then you take 2 parts of 1% and 3 parts of 6% to get 4%.

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