document.write( "Question 1096956: A scientist has acid solutions with concentrations of 4% and 15%. He wants to mix some of each solution to get 44 milliliters of solution with a 12% concentration. How many milliliters of each solution does he need to mix together? \n" ); document.write( "
Algebra.Com's Answer #711355 by Fombitz(32388)\"\" \"About 
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Let \"X\" be the amount of 4% solution.
\n" ); document.write( "Let \"Y\" be the amount of 15% solution.
\n" ); document.write( "1.\"X%2BY=44\" Total volume.
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\n" ); document.write( "2.\"4X%2B15Y=12%28X%2BY%29=12%2844%29=528\" Total concentration.
\n" ); document.write( "Multiply eq.1 by 4 and subtract from eq. 2,
\n" ); document.write( "\"4X%2B15Y-4X-4Y=528-176\"
\n" ); document.write( "\"11Y=352\"
\n" ); document.write( "Solve for Y then use either equation to solve for X.
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