document.write( "Question 338635: what quantity x of a 65% acid solution must be mixed with a 20% solution to produce 300 ml of a 45% solution? \n" ); document.write( "

Algebra.Com's Answer #242721 by Alan3354(69443) $\"\"$ $\"About$

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\n" ); document.write( "What quantity x of a 75% acid solution must be mixed with a 25% solution to produce 500 mL of a 40% solution?
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\n" ); document.write( "s = 75% acid volume
\n" ); document.write( "t = 25% acid volume
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\n" ); document.write( "s + t = 500
\n" ); document.write( "0.75s + 0.25t = 0.4*500 = 200 --> x4
\n" ); document.write( "3s + t = 800
\n" ); document.write( "1s + t = 500
\n" ); document.write( "-------------- Subtract
\n" ); document.write( "2s = 300
\n" ); document.write( "s = 150 ml of 75%
\n" ); document.write( "t = 350 ml of 25%
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