document.write( "Question 1081001: How much pure disinfectant must be added to 30 gallons of an 8% solution to increase its strength of 25%?
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Algebra.Com's Answer #695073 by ikleyn(52787) $\"\"$ $\"About$

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document.write( "Let x be the volume of the pure disinfectant under the question, in gallons.\r\n" );
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document.write( "Then the volume of the new mixture will be (30 + x) and the volume content of the pure disinfectant in the new mixture \r\n" );
document.write( "     will be 0.08*30 + x gallons.\r\n" );
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document.write( "So, the concentration equation is\r\n" );
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document.write( " = 0.25.\r\n" );
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document.write( "Simplify and solve it for x:\r\n" );
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document.write( "2.4 + x = 0.25*(30+x),\r\n" );
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document.write( "2.4 + x = 7.5 + 0.25x,\r\n" );
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document.write( "x - 0.25x = 7.5 - 2.4,\r\n" );
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document.write( "0.75x = 5.1  ---->  x =  = 6.8.\r\n" );
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document.write( "Answer.  6.8 gallons of the pure disinfectant must be added.\r\n" );
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\n" ); document.write( "\n" ); document.write( "There is entire bunch of lessons covering various types of mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - Mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - More Mixture problems\r
\n" ); document.write( "\n" ); document.write( "    - Solving typical word problems on mixtures for solutions \r
\n" ); document.write( "\n" ); document.write( "    - Word problems on mixtures for antifreeze solutions \r
\n" ); document.write( "\n" ); document.write( "    - Word problems on mixtures for alloys \r
\n" ); document.write( "\n" ); document.write( "    - Typical word problems on mixtures from the archive\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Read them and become an expert in solution the mixture word problems.\r
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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
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\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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