Question 450429
------	percent	----------------	quantity										
Alloy I	15	----------------20	pounds							
Alloy II	10	----------------x pounds							
Total	12----------------20+x	pounds							
													
15*20+10*x=12(20+x)							
300+10x=240+12x					
10x-12x=240-300					
-2x=-60										
/-2										
x=	30	pounds	10	%	Alloy II