Question 427227
.........Percent	----------------	quantity										
Solution A 60	----------------	30								
Water	0----------------x								
Total	40----------------30+x						
60*25+0*	x=40(25+	x)							
1500	+	0	x	=	1000	+	40	x	
0	x	-	40	x	=	1000	-	1500	
-40	x	=	-500										
/-40	
								
x=12.5 quartz water

12.5 quartz of solution has to be drained.