document.write( "Question 1161827: In a tropical fish store, one tank contains 65 kilograms of seawater with 7% salt.
\n" ); document.write( "a. How much pure water must be added to have 5% salt?
\n" ); document.write( "b. How much water must be evaporated to contain 9% salt? \n" ); document.write( "
Algebra.Com's Answer #785460 by ikleyn(52790)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "(a)  The amount (the mass) of salt is  0.07*65 kilograms = 4.55 kilograms.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "     To dilute it to 5% salt by mass, the amount (the mass) of water \"m\" should be added to get\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "        \"%280.07%2A65%29%2F%2865%2Bm%29\" = 0.05.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    Solve this equation for \"m\".\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "        \"%280.07%2A65%29%2F0.05\" = 65 + m\r\n" );
document.write( "\r\n" );
document.write( "        7*13 = 65 + m\r\n" );
document.write( "\r\n" );
document.write( "        91   = 65 + m\r\n" );
document.write( "\r\n" );
document.write( "        m    = 91-65 = 26 kilograms of pure water, or 26 liters.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    ANSWER.  26 liters (kilograms) of water should be added.\r\n" );
document.write( "
\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Part (a) is just solved.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\r\n" );
document.write( "(b)  The mass \"m\" of water should be evaporated to satisfy this concentration eauation\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "        \"%280.07%2A65%29%2F%2865-m%29\" = 0.09.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    Solve it for \"m\"\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "        \"%280.07%2A65%29%2F0.09\" = 65 - m\r\n" );
document.write( "\r\n" );
document.write( "        50.555      = 65 - m\r\n" );
document.write( "\r\n" );
document.write( "        m           = 65 - 50.555 = 14.444  kilograms of water must be evaporated.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    ANSWER.  14.444 kilograms / (liters) of water must be evaporated.\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( "See the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Special type mixture problems on DILUTION adding water\r
\n" ); document.write( "\n" ); document.write( "    - How much water must be evaporated \r
\n" ); document.write( "\n" ); document.write( "in this site.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "A convenient place to quickly observe these lessons from a  \"bird flight height\"  (a top view)  is the last lesson in the list.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Read them and become an expert in solution the 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 online textbook 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( "\n" ); document.write( " \n" ); document.write( "
\n" );