document.write( "Question 515168: Alyssa is a chemist with Gemco Pharmaceutical Company. She needs to prepare 12 ounces of a 9% hydrochloric acid solution. The only solutions she currently has available are 4% and 12% hydrochloric acid. How much should she use of each solution to obtain the needed solution? Use variables and representation if possible. \n" ); document.write( "

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Alyssa is a chemist with Gemco Pharmaceutical Company. She needs to prepare 12 ounces of a 9% hydrochloric acid solution. The only solutions she currently has available are 4% and 12% hydrochloric acid. How much should she use of each solution to obtain the needed solution? Use variables and representation if possible.
\n" ); document.write( "**
\n" ); document.write( "let x=ounces of 4% solution
\n" ); document.write( "12-x=ounces of 12% solution
\n" ); document.write( "..
\n" ); document.write( "4%x+12%(12-x)=9%*12
\n" ); document.write( ".04x+1.44-.12x=.09*12
\n" ); document.write( "-.08x=-.36
\n" ); document.write( "x=.36/.08
\n" ); document.write( "4=4.5 ounces
\n" ); document.write( "ans:
\n" ); document.write( "Alyssa should use of each of the following solutions to obtain the needed solution
\n" ); document.write( "4.5 ounces of 4% solution
\n" ); document.write( "and
\n" ); document.write( "7.5 ounces of 12% solution \n" ); document.write( "

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