document.write( "Question 423888: How many liters of a 14% alcohol solution must be mixed with 20 L of a 50% solution to get a 30% solution? Show you process.\r
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\n" ); document.write( "\n" ); document.write( "Thank you!!
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Algebra.Com's Answer #295701 by dnanos(83)\"\" \"About 
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let x litters of the 14% solution.
\n" ); document.write( "Then we obtain x+20 litters of the 30%.
\n" ); document.write( "The pure alcohol litters before and after mixing must be equal.
\n" ); document.write( "So we obtain an equation
\n" ); document.write( "\"%2814%2F100%29%2Ax%2B%2850%2F100%29%2A20=%2830%2F100%29%2A%28x%2B20%29\"
\n" ); document.write( "\"14%2F100%2Ax%2B50%2F100%2A20=30%2F100%2A%28x%2B20%29\"
\n" ); document.write( "Multiply by 100
\n" ); document.write( "\"14x%2B50%2A20=30%28x%2B20%29\"
\n" ); document.write( "\"14x%2B1000=30x%2B600\"
\n" ); document.write( "\"1000-600=30x-14\"
\n" ); document.write( "\"400=16x\"
\n" ); document.write( "\"16x=400\"
\n" ); document.write( "Divide by 16
\n" ); document.write( "\"x=400%2F16\"
\n" ); document.write( "x=25
\n" ); document.write( "So 25 litters 14% needed.
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