document.write( "Question 1105018: How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid to obtain a mixture containing a 40% solution of acid? \n" ); document.write( "

Algebra.Com's Answer #719797 by richwmiller(17219) $\"\"$ $\"About$

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We have 20 qts of 20% solution.
\n" ); document.write( "Using the method of alligation.
\n" ); document.write( "20= 40 - 20
\n" ); document.write( "10= 50 - 40
\n" ); document.write( "40.0= 20/(10/20) qts of 50% solution to add to your 20 qts of 20% solution.
\n" ); document.write( "60.0= (20+40.0) qts of the final 40% solution.
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\n" ); document.write( "0.5 * 40.0 + 0.2 * 20 = 0.4*(20+40.0)
\n" ); document.write( "20.0 + 4.0 = 0.4*(60.0)
\n" ); document.write( "24.0 = 24.0
\n" ); document.write( "ok
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document.write( "20         10        20 qts of 20% solution\r\n" );
document.write( "      40            60 qts of 40% solution\r\n" );
document.write( "50         20 20/10*20=40 qts of 50% solution\r\n" );
document.write( "           30\r\n" );
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