document.write( "Question 908495: how many lb. of metal containing 30% copper must be combined with 12 lb. of pure copper to form an alloy containing 86% copper \n" ); document.write( "

Algebra.Com's Answer #551087 by josgarithmetic(39617) $\"\"$ $\"About$

You can put this solution on YOUR website!
The problem is one of these kinds, solved in the same way:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Mixture: one material quantity unknown - http://www.algebra.com/my/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The pure copper is 100% copper. \n" ); document.write( "

\n" );