document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=621355>Question 621355</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many grams of an alloy that is 70% gold should be melted with 20 grams of an alloy that is 10% gold to produce an alloy that is 60% gold ? </SPAN>\n" );
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document.write( "x*0.70 + 20*0.10 = (x+20)*0.60<br><BR>\n" );
document.write( "Now we use algebra to solve it. First we simplify each side:<BR>\n" );
document.write( "0.70x + 2 = 0.60x + 12<BR>\n" );
document.write( "Subtract 0.60x from each side:<BR>\n" );
document.write( "0.10x + 2 = 12<BR>\n" );
document.write( "Subtracting 2:<BR>\n" );
document.write( "0.10x = 10<BR>\n" );
document.write( "Dividing both sides by 0.10:<BR>\n" );
document.write( "x = 100<br><BR>\n" );
document.write( "So we mix 100 grams of the 70% gold with the 20 grams of the 10% gold to get 100+20 or 120 grams of 60% gold. </SPAN>\n" );
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