document.write( "Question 1091613: how many quarts of pure antifreeze must be added to 8 quarts of a 50% antifreeze solution to obtain a 60% antifreeze ?''.
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Algebra.Com's Answer #706049 by ikleyn(52784)\"\" \"About 
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document.write( "Let x be the volume of the pure antifreeze under the question, in quarts.\r\n" );
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document.write( "8 quarts of the 50% antifreeze solution contain 0.5*8 quarts of the pure antifreeze.\r\n" );
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document.write( "When we add x quarts of the pure antifreeze, the amount of pure antifreeze becomes x + 0.5*8 quarts.\r\n" );
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document.write( "The total volume of liquid solution becomes (x+8) quarts.\r\n" );
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document.write( "Therefore, the antifreeze concentration after adding becomes  \"%28x+%2B+0.5%2A8%29%2F%28x%2B8%29\".\r\n" );
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document.write( "According to the condition, it must be 60% = 0.6. It gives you an equation\r\n" );
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document.write( "\"%28x+%2B+0.5%2A8%29%2F%28x%2B8%29\" = 0.6.\r\n" );
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document.write( "To solve it, first multiply both sides by (x+8). You will get\r\n" );
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document.write( "x + 4 = 0.6*(x+8),   or\r\n" );
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document.write( "x + 4 = 0.6x + 4.8  ====>  x - 0.6x = 4.8 - 4  ====>  0.4x = 0.8  ====>  x = \"0.8%2F0.4\" = 2.\r\n" );
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document.write( "Answer. 2 quarts of the pure antifreeze must be added.\r\n" );
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\n" ); document.write( "\n" ); document.write( "There is entire bunch of introductory lessons covering various types of mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - Mixture problems\r
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\n" ); document.write( "\n" ); document.write( "    - Word problems on mixtures for alloys \r
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\n" ); document.write( "\n" ); document.write( "Among them, find the lesson on antifreeze marked by (*).
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this textbook in the section \"Word problems\" under the topic \"Mixture problems\".\r
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