document.write( "Question 784163: how many quarts of pure antifreeze must be added to 2 quarts of 20% antifreeze solution to obtain a 40% antifreeze solution? \n" ); document.write( "
Algebra.Com's Answer #477038 by lwsshak3(11628)\"\" \"About 
You can put this solution on YOUR website!
how many quarts of pure antifreeze must be added to 2 quarts of 20% antifreeze solution to obtain a 40% antifreeze solution?
\n" ); document.write( "***
\n" ); document.write( "let x=amount of pure antifreeze to be added
\n" ); document.write( "20%*2+100%x=40%(2+x)
\n" ); document.write( ".4+x=.8+.4x
\n" ); document.write( "0.6x=0.4
\n" ); document.write( "x=.4/.6=2/3
\n" ); document.write( "amount of pure antifreeze to be added=2/3 quart
\n" ); document.write( "
\n" );