document.write( "Question 1126707: How much water should be mixed with an 8% plant fertilizer solution to make a half gallon of a 2% plant fertilizer solution? \r
\n" ); document.write( "\n" ); document.write( "______ gallons of water should be mixed with an 8% plant fertilizer solution to make a half gallon of a 2% plant fertilizer solution. \n" ); document.write( "
Algebra.Com's Answer #743045 by ikleyn(52794)\"\" \"About 
You can put this solution on YOUR website!
.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "            The solution by  @josgarithmetic  is   T O T A L L Y   W R O N G. \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "            Below find a correct solution.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\r\n" );
document.write( "Let x be the volume of water to be added, in gallons.\r\n" );
document.write( "\r\n" );
document.write( "Then the volume of the 8% plant fertilizer solution to use is (0.5-x) gallons.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "The 8% plant fertilizer solution contains 0.08*(0.5-x) gallons of the pure fertilizer.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Divided by the total volume of 0.5 gallons, it should give the 2% concentration\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    \"%280.08%2A%280.5-x%29%29%2F0.5\" = 0.02.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Simplify by multiplying both sides by 0.5\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    0.08*(0.5-x) = 0.5*0.02 = 0.01.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "It gives you\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    0.5 - x = \"0.01%2F0.08\" = \"1%2F8\",   and then\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    x = 0.5 - \"1%2F8\" = \"3%2F8\" gallons of water.    \r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Answer.  \"3%2F8\" gallons of water should be added, which is exactly 3 pints of water.\r\n" );
document.write( "
\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "------------------\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Compare it with the answer by @josgaritmetic, who gives 1 pint of water.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "@josgarithmetic is VERY well known (or better to say, very badly known, unfortunately) in this forum,
\n" ); document.write( "for his inability to solve problems and make calculations correctly.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So be very careful when you obtain \"solutions\" from him.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "In half of all cases they are wrong.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Do not trust him and always wait for reaction of other tutors.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "In the normal school environment he would be fired in the second day.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );