document.write( "Question 478270: Ms. Lopez needs to make 70 millimeters of a 25% acid solution by mixing together a 15% acid solution with a 40% acid solution. How much of each solution must she use? \n" ); document.write( "

Algebra.Com's Answer #327699 by cleomenius(959) $\"\"$ $\"About$

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I would set up an allegation as follows:\r
\n" ); document.write( "\n" ); document.write( "Set up a tic tac toe board with:\r
\n" ); document.write( "\n" ); document.write( "40%, the highest concentration in the top left Square.
\n" ); document.write( "15%, the lowest concentration, in the bottom left Square.
\n" ); document.write( "25%, the percent we want in the middle Square.\r
\n" ); document.write( "\n" ); document.write( "40% | . . . | ... .
\n" ); document.write( "__________\r
\n" ); document.write( "\n" ); document.write( " . .. . | 25% | .. .
\n" ); document.write( "__________\r
\n" ); document.write( "\n" ); document.write( "15% | ... . | ... .\r
\n" ); document.write( "\n" ); document.write( " In the lower right corner, put 40% minus 25%; this is the parts of the 15 % you need.
\n" ); document.write( "In the upper right corner, put 25% minus 15%; this is the parts of the 40 % you need.\r
\n" ); document.write( "\n" ); document.write( "40% | . . . | 10
\n" ); document.write( "__________\r
\n" ); document.write( "\n" ); document.write( " . .. . | 25% | .. .
\n" ); document.write( "__________\r
\n" ); document.write( "\n" ); document.write( "15% | ... . | 15\r
\n" ); document.write( "\n" ); document.write( "The total parts you need is 25.
\n" ); document.write( "The 40% needs 10/25, or 2/5 of 70 ml = 28 ml.
\n" ); document.write( "the 15% needs 15/25, or 3/5 of 70 ml = 42 ml.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Cleomenius.\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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