document.write( "Question 486301: A metallurgist needs to make 3 oz. of an alloy containing 76% platinum. She is going to melt and combine one metal that is 90% platinum with another metal that is 70% platinum. How much of each should she use? \n" ); document.write( "
Algebra.Com's Answer #332423 by mananth(16946)![]() ![]() You can put this solution on YOUR website! percent percentage ---------------- quantity \n" ); document.write( "Metal I 90 ---------------- x Oz \n" ); document.write( "Metal II 70 ---------------- 3 - x Oz \n" ); document.write( "Mixture 76.00% ---------------- 3 \n" ); document.write( " \n" ); document.write( "90x+70( 3-x) = 76 * 3 \n" ); document.write( " \n" ); document.write( "90x+210 - 70 x = 228 \n" ); document.write( "90 x - 70 x= 228 - 210 \n" ); document.write( "20 x = 18 \n" ); document.write( "/ 20 \n" ); document.write( " x = 0.9Oz 90.00% Metal I \n" ); document.write( "2.1 Oz 70.00% Metal II \n" ); document.write( " \n" ); document.write( " |