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by Cora
(Oak Park, CA, USA)

How many grams of petrolatum should you add to 30 g of hydrocortisone 2.5% ointment to reduce its strength to 2.0%? The percent strength of petrolatum is zero.

 Sep 04, 2011 The correct answer by: Keith Using an alligation for this one is possible. However, an Algebra equation is more practical.Here's the set-up30(0.025) = (30+X)(0.02)Do the math, and X = 7.5and Grams is the variable we were working with.Answer = 7.5 grams

 Aug 16, 2011 tic tac toe? by: Anonymous 2.5 2 parts of 2.5% 20 0.5 parts of 0%2.5 total parts0.5/2.5= 0.20.2 x 30g= 6 grams

 Aug 06, 2011 NOT 0.25 by: Anonymous NOT USING ALLIGATION30*0.025= X*0.02.IT'S NOT 0.25

 Jul 09, 2011 I did not do a allegation. by: Anonymous IV*IS=FV*FS so 30g*.25=FV*.02 multiply 30*.25=7.5 then divide 7.5/.02 equals 375 grams of %2.0 so 375-30=345 add 345 grams

 May 28, 2011 Please check by: Anonymous I got 7.5 grams.Is this correct?

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