document.write( "Question 1124590: If you have 1.75L of an 18% alcohol solution, how much pure alcohol must you add in order to increase the concentration to 60%? \n" ); document.write( "
Algebra.Com's Answer #740946 by ikleyn(52786)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "
\r\n" );
document.write( "Your equation is\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    \"%280.18%2A1.75+%2B+A%29%2F%281.75%2BA%29\" = 0.6,   \r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "where A is the amount of the pure alcohol to add.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    0.18*1.75 + A = 0.6*(1.75 + A)\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    A - 0.6*A = 0.6*1.75 - 0.18*1.75\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    A = \"%280.6%2A1.75+-+0.18%2A1.75%29%2F%281-0.6%29\" = 1.8375 liters of pure alcohol to add.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Check.  \"%280.18%2A1.75+%2B+1.8375%29%2F%281.75%2B1.8375%29\" = 0.6.   ! Correct !\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Answer.  1.8375 liters of pure alcohol to add.\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( "It is a standard and typical mixture problem.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "For introductory lessons covering various types of mixture word problems see\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( "    - Typical word problems on mixtures from the archive\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "You will find there ALL TYPICAL mixture problems with different methods of solutions,
\n" ); document.write( "explained at different levels of detalization,  from very detailed to very short.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Read them and become an expert in solution mixture word problems.\r
\n" ); document.write( "
\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
\n" ); document.write( "
\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
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "-------------------\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Be aware :   the solution and the answer by  @josgaritmetic are   T O T A L L Y   W R O N G.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "For your safety, simply ignore it !\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "--------------
\n" ); document.write( "Comment from student : But josarfthmetic got the same answer? anyway thanks
\n" ); document.write( "--------------\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "My response : Yes, he got the correct answer by fixing his errors after my notice.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );