document.write( "Question 275411: In a chemistry class, 6 liters of 4% silver iodide solution must be mixed with 10% solution to get a 6% solution. How many liters of 10% solution are needed? \n" ); document.write( "

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\n" ); document.write( "In a chemistry class, 6 liters of 4% silver iodide solution must be mixed with 10% solution to get a 6% solution.
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document.write( "Let x be the volume (in liters) of the 10% silver iodide solution to add.\r\n" );
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document.write( "Write the balance equation for solute (silver iodide)\r\n" );
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document.write( "    0.04*6 + 0.1x = 0.06*(6+x).\r\n" );
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document.write( "Simplify and find x\r\n" );
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document.write( "    0.24 + 0.1x = 0.36 + 0.06x,\r\n" );
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document.write( "    0.1x - 0.06x = 0.36 - 0.24,\r\n" );
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document.write( "        0.04x    =     0.12\r\n" );
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document.write( "            x    =     0.12/0.04 = 3.\r\n" );
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document.write( "ANSWER.  3 liters of the 10% silver iodide solution should be added.\r\n" );
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