document.write( "Question 272694: A solution of 9% is mixed with a solution of 30% to form an 18% solution. How many of each solution should be used to form 21 liters of the 18% solution? \n" ); document.write( "

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A solution of 9% is mixed with a solution of 30% to form an 18% solution. How many of each solution should be used to form 21 liters of the 18% solution?\r
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\n" ); document.write( "\n" ); document.write( "Let 30% solution added be x\r
\n" ); document.write( "\n" ); document.write( "9%------------------ 30%------------------ 18% mix\r
\n" ); document.write( "\n" ); document.write( "21-x---------------------x-----------------------21\r
\n" ); document.write( "\n" ); document.write( "0.09(21-x)+0.3x= 0.18*21\r
\n" ); document.write( "\n" ); document.write( "1.89-0.09x+0.3x = 3.78\r
\n" ); document.write( "\n" ); document.write( "1.89 + 0.21x =3.78\r
\n" ); document.write( "\n" ); document.write( "0.21x= 3.78-1.89\r
\n" ); document.write( "\n" ); document.write( "x= 1.89/0.21\r
\n" ); document.write( "\n" ); document.write( "x= 9 liters = 30 % solution\r
\n" ); document.write( "\n" ); document.write( "21-9 = 12 liters 9% solution\r
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