document.write( "Question 651716: How much of a 50% acid solution must be mixed with 50 gallons of a 12% acid solution to obtain a solution that is 40% acid?\r
\n" ); document.write( "\n" ); document.write( "I tried to do 0.5X + 50(0.12)= 0.4, but I got a negative answer.
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Algebra.Com's Answer #407775 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
 
\n" ); document.write( "Hi,
\n" ); document.write( "Correct Set Up is:
\n" ); document.write( " 0.5X + 50(0.12)= 0.4(X+50) ||The amount of 'solution' on both sides must be the same
\n" ); document.write( " \"+.1X+=+.28%2A50\"
\n" ); document.write( " X = 140gal of 50% solution needed
\n" ); document.write( "and..
\n" ); document.write( "\".5%2A140+%2B+.12%2A50+=+70+%2B+6+=+76+=+.4%2A190\" \n" ); document.write( "
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