document.write( "Question 606225: how much pure acid should be mixed with 5 gallons of a 40% acid solution in order to get a 50% acid solution? \n" ); document.write( "
Algebra.Com's Answer #381959 by mathie123(224)\"\" \"About 
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Pure acid-- this means that we have 100% acid \r
\n" ); document.write( "\n" ); document.write( "Using that fact:
\n" ); document.write( "we have the following equation:
\n" ); document.write( "\"x%2A1.00%2B5%2A0.4=%28x%2B5%29%2A0.50\"\r
\n" ); document.write( "\n" ); document.write( "where x is the amount of pure acid that is added (also note that we will end up with x+5 gallons in the end)\r
\n" ); document.write( "\n" ); document.write( "From here it is a matter of algebra and solving for x. \r
\n" ); document.write( "\n" ); document.write( "try it yourself from this step, and let me know if you have any difficulties:)
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