document.write( "Question 604450: Lisa will make punch that is 25% fruit juice by
\n" ); document.write( "adding pure fruit juice to a 2-liter mixture that
\n" ); document.write( "is 10% pure fruit juice. How many liters of pure
\n" ); document.write( "fruit juice does she need to add?
\n" ); document.write( "

Algebra.Com's Answer #381201 by alicealc(293)\"\" \"About 
You can put this solution on YOUR website!
pure fruit juice means 100% fruit juice
\n" ); document.write( "let the pure fruit juice = x liter\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "100%*x + 10%*2 = 25%*(x + 2)
\n" ); document.write( "(omit all the % sign)
\n" ); document.write( "100*x + 10*2 = 25*(x + 2)
\n" ); document.write( "100x + 20 = 25x + 50
\n" ); document.write( "100x - 25x = 50 - 20
\n" ); document.write( "75x = 30
\n" ); document.write( "x = 30/75 = 10/25 = 2/5 = 0.4\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "so, she needs to add 0.4 liter of pure fruit juice
\n" ); document.write( "
\n" ); document.write( "
\n" );