document.write( "Question 120409: This problem stumped my girlfriend and I please help\r
\n" ); document.write( "\n" ); document.write( "How many gallons of a 4% acid solution should be mixed with 20 Gallons of a 10% acid solution to obtain a mixture that is 5% acid? \r
\n" ); document.write( "\n" ); document.write( "Please show work that way I can see what I was doing wrong...\r
\n" ); document.write( "\n" ); document.write( "Thank you
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Algebra.Com's Answer #88252 by scott8148(6628)\"\" \"About 
You can put this solution on YOUR website!
the concentration multiplied by the volume of solution gives the amount of acid
\n" ); document.write( "__ the amount should be the same on both sides of the equation\r
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\n" ); document.write( "\n" ); document.write( "let x=\"gallons of 4%\" __ x(4%)+20(10%)=(20+x)(5%) __ multiplying by 100 clears the percents\r
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\n" ); document.write( "\n" ); document.write( "4x+200=100+5x __ 100=x
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